diff --git a/crates/op-orchestrator/src/cleanup.rs b/crates/op-orchestrator/src/cleanup.rs
index e42ada714..dadb727a7 100644
--- a/crates/op-orchestrator/src/cleanup.rs
+++ b/crates/op-orchestrator/src/cleanup.rs
@@ -82,6 +82,75 @@ fn remove_duplicate_status_bars(sink: &mut dyn DocSink, root_id: &str) {
     }
 }
 
+pub(crate) fn remove_duplicate_bottom_nav_sections_for_all_roots(sink: &mut dyn DocSink) {
+    let root_ids: Vec<String> = sink
+        .state()
+        .active_children()
+        .iter()
+        .map(|node| node.id_str().to_string())
+        .collect();
+    for root_id in root_ids {
+        remove_duplicate_bottom_nav_sections(sink, &root_id);
+    }
+}
+
+/// Mobile root-level bottom-nav dedupe. Weak-model Chinese prompts can produce
+/// both a localized bottom nav section and an English normalized bottom nav.
+/// Keep the bottom-most/last top-level nav and remove earlier duplicates.
+fn remove_duplicate_bottom_nav_sections(sink: &mut dyn DocSink, root_id: &str) {
+    let dupes: Vec<NodeId> = {
+        let Some(root) = find_root(sink.state(), root_id) else {
+            return;
+        };
+        if !is_mobile_root(root) {
+            return;
+        }
+        let Some(children) = root.children() else {
+            return;
+        };
+        let nav_indices: Vec<usize> = children
+            .iter()
+            .enumerate()
+            .filter_map(|(index, child)| is_bottom_nav_section(child).then_some(index))
+            .collect();
+        if nav_indices.len() < 2 {
+            return;
+        }
+        let keep_index = nav_indices
+            .iter()
+            .copied()
+            .max_by(|a, b| compare_bottom_nav_position(children, *a, *b))
+            .expect("nav_indices is non-empty");
+        nav_indices
+            .into_iter()
+            .filter(|index| *index != keep_index)
+            .map(|index| NodeId::new(children[index].id_str().to_string()))
+            .collect()
+    };
+    for id in dupes {
+        sink.apply(EditorCommand::DeleteNode {
+            node_id: id,
+            page_id: None,
+        });
+    }
+}
+
+fn is_bottom_nav_section(node: &PenNode) -> bool {
+    cleanup_mobile_chrome::bottom_nav_surface_target(node, false).is_some()
+}
+
+fn compare_bottom_nav_position(
+    children: &[PenNode],
+    left_index: usize,
+    right_index: usize,
+) -> std::cmp::Ordering {
+    let left_y = children[left_index].base().y.unwrap_or(left_index as f64);
+    let right_y = children[right_index].base().y.unwrap_or(right_index as f64);
+    left_y
+        .total_cmp(&right_y)
+        .then_with(|| left_index.cmp(&right_index))
+}
+
 /// Pass ②:移动端浅色 root 下的 nav surface 纠偏。弱模型常把
 /// bottom nav / tab bar 套用成黑色安全模板,和当前浅色页面调性断裂。
 /// TS 端只补"缺失 fill"的 nav;Rust cleanup 还需要兜住已写
@@ -818,6 +887,7 @@ pub fn run_cleanup_passes(sink: &mut dyn DocSink, plan: &OrchestratorPlan, root_
         let rid = rid.as_str();
 
         remove_duplicate_status_bars(sink, rid);
+        remove_duplicate_bottom_nav_sections(sink, rid);
         repair_light_mobile_nav_surfaces(sink, rid);
         repair_mobile_content_sections(sink, rid);
         cleanup_mobile_chrome::repair_mobile_structural_chrome(sink, rid);
@@ -964,6 +1034,10 @@ mod tests_mobile_dense;
 #[path = "cleanup_mobile_chrome_tests.rs"]
 mod tests_mobile_chrome;
 
+#[cfg(test)]
+#[path = "cleanup_mobile_bottom_nav_dedup_tests.rs"]
+mod tests_mobile_bottom_nav_dedup;
+
 #[cfg(test)]
 #[path = "cleanup_desktop_dashboard_tests.rs"]
 mod tests_desktop_dashboard;
diff --git a/crates/op-orchestrator/src/cleanup_mobile_bottom_nav_dedup_tests.rs b/crates/op-orchestrator/src/cleanup_mobile_bottom_nav_dedup_tests.rs
new file mode 100644
index 000000000..07efab041
--- /dev/null
+++ b/crates/op-orchestrator/src/cleanup_mobile_bottom_nav_dedup_tests.rs
@@ -0,0 +1,268 @@
+use super::*;
+use crate::plan::{OrchestratorPlan, RootFrameSpec};
+use crate::test_support::VecDocSink;
+
+fn plan() -> OrchestratorPlan {
+    OrchestratorPlan {
+        root_frame: RootFrameSpec {
+            id: "root".into(),
+            name: "Mobile".into(),
+            width: 390.0,
+            height: 844.0,
+            layout: None,
+            gap: None,
+            padding: None,
+            fill: None,
+        },
+        subtasks: vec![],
+        style_guide_name: None,
+    }
+}
+
+fn insert_tree(sink: &mut VecDocSink, json: &str) {
+    let tree: PenNode = serde_json::from_str(json).expect("test tree json");
+    sink.state.apply(EditorCommand::InsertAuthoredSubtree {
+        nodes: vec![tree],
+        parent_id: NodeId::NONE,
+        page_id: None,
+    });
+    sink.applied.clear();
+}
+
+fn find_node<'a>(node: &'a PenNode, id: &str) -> Option<&'a PenNode> {
+    if node.id_str() == id {
+        return Some(node);
+    }
+    node.children()?
+        .iter()
+        .find_map(|child| find_node(child, id))
+}
+
+fn find_active_node<'a>(sink: &'a VecDocSink, id: &str) -> Option<&'a PenNode> {
+    sink.state
+        .active_children()
+        .iter()
+        .find_map(|node| find_node(node, id))
+}
+
+fn active_root(sink: &VecDocSink) -> &PenNode {
+    find_active_node(sink, "root").expect("root survives")
+}
+
+fn direct_child_ids(root: &PenNode) -> Vec<&str> {
+    root.children()
+        .into_iter()
+        .flatten()
+        .map(PenNode::id_str)
+        .collect()
+}
+
+#[test]
+fn bottom_nav_detected_by_cjk_name() {
+    let mut sink = VecDocSink::new();
+    insert_tree(
+        &mut sink,
+        r##"{
+            "type": "frame",
+            "id": "root",
+            "name": "Chinese Mobile Screen",
+            "width": 390,
+            "height": 844,
+            "layout": "vertical",
+            "fill": [{ "type": "solid", "color": "#FFFFFF" }],
+            "children": [
+                {
+                    "type": "frame",
+                    "id": "content",
+                    "name": "Content",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 300,
+                    "children": []
+                },
+                {
+                    "type": "frame",
+                    "id": "cjk-nav-section",
+                    "name": "底部导航栏",
+                    "role": "section",
+                    "x": 24,
+                    "width": 342,
+                    "height": 88,
+                    "layout": "horizontal",
+                    "children": []
+                }
+            ]
+        }"##,
+    );
+
+    run_cleanup_passes(&mut sink, &plan(), &["root"]);
+
+    let nav = find_active_node(&sink, "cjk-nav-section").expect("CJK bottom nav survives");
+    assert_eq!(nav.base().x, Some(0.0));
+    assert_eq!(nav.width_px(), Some(390.0));
+    assert_eq!(nav.height_px(), Some(72.0));
+}
+
+#[test]
+fn duplicate_cjk_and_english_bottom_nav_deduped() {
+    let mut sink = VecDocSink::new();
+    insert_tree(
+        &mut sink,
+        r##"{
+            "type": "frame",
+            "id": "root",
+            "name": "Chinese Mobile Screen",
+            "width": 390,
+            "height": 844,
+            "layout": "vertical",
+            "fill": [{ "type": "solid", "color": "#FFFFFF" }],
+            "children": [
+                {
+                    "type": "frame",
+                    "id": "content",
+                    "name": "Content",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 620,
+                    "children": []
+                },
+                {
+                    "type": "frame",
+                    "id": "cjk-nav-section",
+                    "name": "底部导航栏",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 72,
+                    "layout": "horizontal",
+                    "children": []
+                },
+                {
+                    "type": "frame",
+                    "id": "english-bottom-nav",
+                    "name": "Bottom Navigation",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 72,
+                    "layout": "horizontal",
+                    "children": []
+                }
+            ]
+        }"##,
+    );
+
+    run_cleanup_passes(&mut sink, &plan(), &["root"]);
+
+    let ids = direct_child_ids(active_root(&sink));
+    assert!(
+        !ids.contains(&"cjk-nav-section"),
+        "earlier duplicate is removed"
+    );
+    assert!(
+        ids.contains(&"english-bottom-nav"),
+        "bottom-most duplicate is kept"
+    );
+    assert_eq!(
+        ids.iter()
+            .filter(|id| id.contains("bottom-nav"))
+            .copied()
+            .collect::<Vec<_>>(),
+        vec!["english-bottom-nav"]
+    );
+}
+
+#[test]
+fn single_bottom_nav_not_removed() {
+    let mut sink = VecDocSink::new();
+    insert_tree(
+        &mut sink,
+        r##"{
+            "type": "frame",
+            "id": "root",
+            "name": "Single Nav Mobile Screen",
+            "width": 390,
+            "height": 844,
+            "layout": "vertical",
+            "fill": [{ "type": "solid", "color": "#FFFFFF" }],
+            "children": [
+                {
+                    "type": "frame",
+                    "id": "content",
+                    "name": "Content",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 620,
+                    "children": []
+                },
+                {
+                    "type": "frame",
+                    "id": "cjk-nav-section",
+                    "name": "底部导航栏",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 72,
+                    "layout": "horizontal",
+                    "children": []
+                }
+            ]
+        }"##,
+    );
+
+    run_cleanup_passes(&mut sink, &plan(), &["root"]);
+
+    let ids = direct_child_ids(active_root(&sink));
+    assert!(ids.contains(&"cjk-nav-section"));
+}
+
+#[test]
+fn top_navbar_not_treated_as_bottom_nav() {
+    let mut sink = VecDocSink::new();
+    insert_tree(
+        &mut sink,
+        r##"{
+            "type": "frame",
+            "id": "root",
+            "name": "Top And Bottom Nav Mobile Screen",
+            "width": 390,
+            "height": 844,
+            "layout": "vertical",
+            "fill": [{ "type": "solid", "color": "#FFFFFF" }],
+            "children": [
+                {
+                    "type": "frame",
+                    "id": "top-navbar",
+                    "name": "Top Navigation Bar",
+                    "role": "top-app-bar",
+                    "width": "fill_container",
+                    "height": 64,
+                    "layout": "horizontal",
+                    "children": []
+                },
+                {
+                    "type": "frame",
+                    "id": "content",
+                    "name": "Content",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 556,
+                    "children": []
+                },
+                {
+                    "type": "frame",
+                    "id": "bottom-nav",
+                    "name": "Bottom Navigation",
+                    "role": "section",
+                    "width": "fill_container",
+                    "height": 72,
+                    "layout": "horizontal",
+                    "children": []
+                }
+            ]
+        }"##,
+    );
+
+    run_cleanup_passes(&mut sink, &plan(), &["root"]);
+
+    let ids = direct_child_ids(active_root(&sink));
+    assert!(ids.contains(&"top-navbar"), "top navbar is untouched");
+    assert!(ids.contains(&"bottom-nav"), "sole bottom nav is untouched");
+}
diff --git a/crates/op-orchestrator/src/cleanup_mobile_chrome.rs b/crates/op-orchestrator/src/cleanup_mobile_chrome.rs
index 9f860de63..a45d18cb9 100644
--- a/crates/op-orchestrator/src/cleanup_mobile_chrome.rs
+++ b/crates/op-orchestrator/src/cleanup_mobile_chrome.rs
@@ -247,7 +247,10 @@ fn collect_bottom_nav_chrome_repairs(
     }
 }
 
-fn bottom_nav_surface_target(root_child: &PenNode, allow_structural: bool) -> Option<&PenNode> {
+pub(super) fn bottom_nav_surface_target(
+    root_child: &PenNode,
+    allow_structural: bool,
+) -> Option<&PenNode> {
     if is_bottom_nav_surface(root_child, allow_structural) {
         return Some(root_child);
     }
@@ -286,6 +289,12 @@ fn is_bottom_nav_surface(node: &PenNode, allow_structural: bool) -> bool {
             "bottom-navigation",
             "bottom tab",
             "bottom-tab",
+            "底部导航",
+            "底部导航栏",
+            "导航栏",
+            "底栏",
+            "标签栏",
+            "底部标签栏",
         ],
     ) {
         return true;
diff --git a/crates/op-orchestrator/src/cleanup_mobile_dense.rs b/crates/op-orchestrator/src/cleanup_mobile_dense.rs
index f7d7190f6..d4b9e90cb 100644
--- a/crates/op-orchestrator/src/cleanup_mobile_dense.rs
+++ b/crates/op-orchestrator/src/cleanup_mobile_dense.rs
@@ -151,6 +151,12 @@ fn dense_row_kind(node: &PenNode) -> Option<DenseRowKind> {
             "tab bar",
             "tab-bar",
             "tabbar",
+            "底部导航",
+            "底部导航栏",
+            "导航栏",
+            "底栏",
+            "标签栏",
+            "底部标签栏",
         ],
     ) {
         return Some(DenseRowKind::Nav);
diff --git a/crates/op-orchestrator/src/loop_finalize.rs b/crates/op-orchestrator/src/loop_finalize.rs
index 0ddfb409a..83c73fe0a 100644
--- a/crates/op-orchestrator/src/loop_finalize.rs
+++ b/crates/op-orchestrator/src/loop_finalize.rs
@@ -446,6 +446,7 @@ pub fn apply_loop_finalize(state: &mut EditorState) {
     {
         let mut sink = StateDocSink { state: &mut *state };
         crate::abandoned_duplicate_roots::remove_abandoned_duplicate_roots(&mut sink);
+        crate::cleanup::remove_duplicate_bottom_nav_sections_for_all_roots(&mut sink);
     }
     if state.active_children().is_empty() {
         return;