diff --git a/frontend/src/pages/DataAnnotation/Annotate/LabelStudioTextEditor.tsx b/frontend/src/pages/DataAnnotation/Annotate/LabelStudioTextEditor.tsx
index ac57e7b..4498dee 100644
--- a/frontend/src/pages/DataAnnotation/Annotate/LabelStudioTextEditor.tsx
+++ b/frontend/src/pages/DataAnnotation/Annotate/LabelStudioTextEditor.tsx
@@ -90,9 +90,11 @@ type SwitchDecision = "save" | "discard" | "cancel";
 const LSF_IFRAME_SRC = "/lsf/lsf.html";
 const TASK_PAGE_START = 0;
 const TASK_PAGE_SIZE = 200;
-const NO_ANNOTATION_LABEL = "无标注/不适用";
+const NO_ANNOTATION_LABEL = "无标注";
+const NOT_APPLICABLE_LABEL = "不适用";
 const NO_ANNOTATION_CONFIRM_TITLE = "没有标注任何内容";
 const NO_ANNOTATION_CONFIRM_OK_TEXT = "设为无标注并保存";
+const NOT_APPLICABLE_CONFIRM_TEXT = "设为不适用并保存";
 const NO_ANNOTATION_CONFIRM_CANCEL_TEXT = "继续标注";
 
 type NormalizedTaskList = {
@@ -140,6 +142,9 @@ const resolveTaskStatusMeta = (item: EditorTaskListItem) => {
   if (item.annotationStatus === AnnotationResultStatus.NO_ANNOTATION) {
     return { text: NO_ANNOTATION_LABEL, type: "warning" as const };
   }
+  if (item.annotationStatus === AnnotationResultStatus.NOT_APPLICABLE) {
+    return { text: NOT_APPLICABLE_LABEL, type: "warning" as const };
+  }
   return { text: "已标注", type: "success" as const };
 };
 
@@ -271,26 +276,32 @@ export default function LabelStudioTextEditor() {
     win.postMessage({ type, payload }, origin);
   }, [origin]);
 
-  const confirmNoAnnotation = useCallback(() => {
-    return new Promise<boolean>((resolve) => {
+  const confirmEmptyAnnotationStatus = useCallback(() => {
+    return new Promise<AnnotationResultStatus | null>((resolve) => {
       let resolved = false;
-      const settle = (value: boolean) => {
+      let modalInstance: { destroy: () => void } | null = null;
+      const settle = (value: AnnotationResultStatus | null) => {
         if (resolved) return;
         resolved = true;
         resolve(value);
+        if (modalInstance) modalInstance.destroy();
       };
-      modal.confirm({
+      const handleNotApplicable = () => settle(AnnotationResultStatus.NOT_APPLICABLE);
+      modalInstance = modal.confirm({
         title: NO_ANNOTATION_CONFIRM_TITLE,
         content: (
           <div className="flex flex-col gap-2">
             <Typography.Text>当前未发现任何标注内容。</Typography.Text>
-            <Typography.Text type="secondary">如确认为无标注/不适用，可继续保存。</Typography.Text>
+            <Typography.Text type="secondary">如确认为无标注或不适用，可继续保存。</Typography.Text>
+            <Button type="link" style={{ padding: 0, height: "auto" }} onClick={handleNotApplicable}>
+              {NOT_APPLICABLE_CONFIRM_TEXT}
+            </Button>
           </div>
         ),
         okText: NO_ANNOTATION_CONFIRM_OK_TEXT,
         cancelText: NO_ANNOTATION_CONFIRM_CANCEL_TEXT,
-        onOk: () => settle(true),
-        onCancel: () => settle(false),
+        onOk: () => settle(AnnotationResultStatus.NO_ANNOTATION),
+        onCancel: () => settle(null),
       });
     });
   }, [modal]);
@@ -588,15 +599,17 @@ export default function LabelStudioTextEditor() {
           : undefined;
 
     const annotationRecord = annotation as Record<string, unknown>;
+    const currentTask = tasks.find((item) => item.fileId === String(fileId));
+    const currentStatus = currentTask?.annotationStatus;
+    const hasExistingAnnotation = !!currentTask?.hasAnnotation;
     let resolvedStatus: AnnotationResultStatus;
     if (isAnnotationResultEmpty(annotationRecord)) {
-      const currentStatus = tasks.find((item) => item.fileId === String(fileId))?.annotationStatus;
-      if (currentStatus === AnnotationResultStatus.NO_ANNOTATION) {
-        resolvedStatus = AnnotationResultStatus.NO_ANNOTATION;
+      if (currentStatus === AnnotationResultStatus.ANNOTATED || (hasExistingAnnotation && !currentStatus)) {
+        resolvedStatus = AnnotationResultStatus.ANNOTATED;
       } else {
-        const confirmed = await confirmNoAnnotation();
-        if (!confirmed) return false;
-        resolvedStatus = AnnotationResultStatus.NO_ANNOTATION;
+        const selectedStatus = await confirmEmptyAnnotationStatus();
+        if (!selectedStatus) return false;
+        resolvedStatus = selectedStatus;
       }
     } else {
       resolvedStatus = AnnotationResultStatus.ANNOTATED;
@@ -651,7 +664,7 @@ export default function LabelStudioTextEditor() {
     }
   }, [
     advanceAfterSave,
-    confirmNoAnnotation,
+    confirmEmptyAnnotationStatus,
     currentSegmentIndex,
     message,
     projectId,
diff --git a/frontend/src/pages/DataAnnotation/annotation.model.ts b/frontend/src/pages/DataAnnotation/annotation.model.ts
index 3d53c7c..a63f30c 100644
--- a/frontend/src/pages/DataAnnotation/annotation.model.ts
+++ b/frontend/src/pages/DataAnnotation/annotation.model.ts
@@ -11,6 +11,7 @@ export enum AnnotationTaskStatus {
 export enum AnnotationResultStatus {
   ANNOTATED = "ANNOTATED",
   NO_ANNOTATION = "NO_ANNOTATION",
+  NOT_APPLICABLE = "NOT_APPLICABLE",
 }
 
 export interface AnnotationTask {
diff --git a/runtime/datamate-python/app/db/models/annotation_management.py b/runtime/datamate-python/app/db/models/annotation_management.py
index 6454306..b5f2444 100644
--- a/runtime/datamate-python/app/db/models/annotation_management.py
+++ b/runtime/datamate-python/app/db/models/annotation_management.py
@@ -8,7 +8,12 @@ from app.db.session import Base
 
 ANNOTATION_STATUS_ANNOTATED = "ANNOTATED"
 ANNOTATION_STATUS_NO_ANNOTATION = "NO_ANNOTATION"
-ANNOTATION_STATUS_VALUES = {ANNOTATION_STATUS_ANNOTATED, ANNOTATION_STATUS_NO_ANNOTATION}
+ANNOTATION_STATUS_NOT_APPLICABLE = "NOT_APPLICABLE"
+ANNOTATION_STATUS_VALUES = {
+    ANNOTATION_STATUS_ANNOTATED,
+    ANNOTATION_STATUS_NO_ANNOTATION,
+    ANNOTATION_STATUS_NOT_APPLICABLE,
+}
 
 class AnnotationTemplate(Base):
     """标注配置模板模型"""
@@ -96,7 +101,7 @@ class AnnotationResult(Base):
         String(32),
         nullable=False,
         default=ANNOTATION_STATUS_ANNOTATED,
-        comment="标注状态: ANNOTATED/NO_ANNOTATION",
+        comment="标注状态: ANNOTATED/NO_ANNOTATION/NOT_APPLICABLE",
     )
     created_at = Column(TIMESTAMP, server_default=func.current_timestamp(), comment="创建时间")
     updated_at = Column(TIMESTAMP, server_default=func.current_timestamp(), onupdate=func.current_timestamp(), comment="更新时间")
diff --git a/runtime/datamate-python/app/module/annotation/schema/editor.py b/runtime/datamate-python/app/module/annotation/schema/editor.py
index 127c6ee..36711b3 100644
--- a/runtime/datamate-python/app/module/annotation/schema/editor.py
+++ b/runtime/datamate-python/app/module/annotation/schema/editor.py
@@ -17,6 +17,7 @@ from pydantic import BaseModel, Field, ConfigDict
 from app.db.models.annotation_management import (
     ANNOTATION_STATUS_ANNOTATED,
     ANNOTATION_STATUS_NO_ANNOTATION,
+    ANNOTATION_STATUS_NOT_APPLICABLE,
 )
 
 
@@ -25,6 +26,7 @@ class AnnotationStatus(str, Enum):
 
     ANNOTATED = ANNOTATION_STATUS_ANNOTATED
     NO_ANNOTATION = ANNOTATION_STATUS_NO_ANNOTATION
+    NOT_APPLICABLE = ANNOTATION_STATUS_NOT_APPLICABLE
 
 
 class EditorProjectInfo(BaseModel):
@@ -110,7 +112,7 @@ class UpsertAnnotationRequest(BaseModel):
     annotation_status: Optional[AnnotationStatus] = Field(
         None,
         alias="annotationStatus",
-        description="标注状态（无标注/不适用时传 NO_ANNOTATION）",
+        description="标注状态（无标注传 NO_ANNOTATION，不适用传 NOT_APPLICABLE）",
     )
     expected_updated_at: Optional[datetime] = Field(
         None,
diff --git a/runtime/datamate-python/app/module/annotation/service/editor.py b/runtime/datamate-python/app/module/annotation/service/editor.py
index 51162dd..a3aa466 100644
--- a/runtime/datamate-python/app/module/annotation/service/editor.py
+++ b/runtime/datamate-python/app/module/annotation/service/editor.py
@@ -27,6 +27,7 @@ from app.db.models import AnnotationResult, Dataset, DatasetFiles, LabelingProje
 from app.db.models.annotation_management import (
     ANNOTATION_STATUS_ANNOTATED,
     ANNOTATION_STATUS_NO_ANNOTATION,
+    ANNOTATION_STATUS_NOT_APPLICABLE,
     ANNOTATION_STATUS_VALUES,
 )
 from app.module.annotation.config import LabelStudioTagConfig
@@ -908,6 +909,8 @@ class AnnotationEditorService:
         else:
             if requested_status == ANNOTATION_STATUS_NO_ANNOTATION:
                 final_status = ANNOTATION_STATUS_NO_ANNOTATION
+            elif requested_status == ANNOTATION_STATUS_NOT_APPLICABLE:
+                final_status = ANNOTATION_STATUS_NOT_APPLICABLE
             else:
                 raise HTTPException(status_code=400, detail="未发现标注内容，请确认无标注/不适用后再保存")
 
diff --git a/scripts/db/data-annotation-init.sql b/scripts/db/data-annotation-init.sql
index 0c876a3..f5c3f03 100644
--- a/scripts/db/data-annotation-init.sql
+++ b/scripts/db/data-annotation-init.sql
@@ -65,7 +65,7 @@ CREATE TABLE IF NOT EXISTS t_dm_annotation_results (
     project_id VARCHAR(36) NOT NULL COMMENT '标注项目ID',
     file_id VARCHAR(36) NOT NULL COMMENT '文件ID',
     annotation JSON NOT NULL COMMENT 'Label Studio annotation 原始JSON',
-    annotation_status VARCHAR(32) NOT NULL DEFAULT 'ANNOTATED' COMMENT '标注状态: ANNOTATED/NO_ANNOTATION',
+    annotation_status VARCHAR(32) NOT NULL DEFAULT 'ANNOTATED' COMMENT '标注状态: ANNOTATED/NO_ANNOTATION/NOT_APPLICABLE',
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
     updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
     UNIQUE KEY uk_project_file (project_id, file_id),