diff --git a/backend/app/routers/files.py b/backend/app/routers/files.py
index 85dd770..1f04a55 100644
--- a/backend/app/routers/files.py
+++ b/backend/app/routers/files.py
@@ -514,7 +514,8 @@ async def upload_file(
         # 🔄 리비전 비교 수행 (RULES.md 코딩 컨벤션 준수)
         revision_comparison = None
         materials_to_classify = materials_data
-        
+        purchased_materials_map = {}  # 구매확정된 자재 매핑 (키 -> 구매확정 정보)
+
         if revision != "Rev.0":  # 리비전 업로드인 경우만 비교
             print(f"🔍 [DEBUG] 리비전 비교 시작 - revision: {revision}, parent_file_id: {parent_file_id}")
             try:
@@ -522,20 +523,24 @@ async def upload_file(
                 print(f"🔍 [DEBUG] perform_simple_revision_comparison 호출 중...")
                 revision_comparison = perform_simple_revision_comparison(db, job_no, parent_file_id, materials_data)
                 print(f"🔍 [DEBUG] 리비전 비교 완료: {revision_comparison.keys() if revision_comparison else 'None'}")
-                
+
                 if revision_comparison.get("has_purchased_materials", False):
                     print(f"📊 간단한 리비전 비교 결과:")
                     print(f"  - 구매확정된 자재: {revision_comparison.get('purchased_count', 0)}개")
                     print(f"  - 미구매 자재: {revision_comparison.get('unpurchased_count', 0)}개")
                     print(f"  - 신규 자재: {revision_comparison.get('new_count', 0)}개")
-                    print(f"  - 변경된 자재: {revision_comparison.get('changed_count', 0)}개")
-                    
+                    print(f"  - 제외된 구매확정 자재: {revision_comparison.get('excluded_purchased_count', 0)}개")
+
                     # 신규 및 변경된 자재만 분류
                     materials_to_classify = revision_comparison.get("materials_to_classify", [])
                     print(f"  - 분류 필요: {len(materials_to_classify)}개")
+
+                    # 🔥 구매확정된 자재 매핑 정보 저장
+                    purchased_materials_map = revision_comparison.get("purchased_materials_map", {})
+                    print(f"  - 구매확정 자재 매핑: {len(purchased_materials_map)}개")
                 else:
                     print("📝 이전 구매확정 자료 없음 - 전체 자재 분류")
-                    
+
             except Exception as e:
                 print(f"⚠️ 리비전 비교 실패, 전체 자재 분류로 진행: {str(e)}")
                 import traceback
@@ -752,23 +757,42 @@ async def upload_file(
             if not full_material_grade and material_data.get("material_grade"):
                 full_material_grade = material_data["material_grade"]
             
+            # 🔥 구매확정 상태 확인 (리비전인 경우)
+            is_purchase_confirmed = False
+            purchase_confirmed_at = None
+            purchase_confirmed_by = None
+
+            if parent_file_id and purchased_materials_map:
+                # 자재 식별 키 생성 (리비전 비교와 동일한 방식)
+                material_key = f"{description.strip().upper()}|{size_spec or ''}"
+
+                if material_key in purchased_materials_map:
+                    # 이전 리비전에서 구매확정된 자재
+                    purchased_info = purchased_materials_map[material_key]
+                    is_purchase_confirmed = True
+                    purchase_confirmed_at = purchased_info.get("purchase_confirmed_at")
+                    purchase_confirmed_by = purchased_info.get("purchase_confirmed_by")
+                    print(f"🔥 구매확정 상태 상속: {description[:50]}...")
+
             # 기본 자재 정보 저장
             material_insert_query = text("""
                 INSERT INTO materials (
-                    file_id, original_description, quantity, unit, size_spec, 
-                    main_nom, red_nom, material_grade, full_material_grade, line_number, row_number, 
-                    classified_category, classification_confidence, is_verified, 
-                    drawing_name, line_no, created_at
+                    file_id, original_description, quantity, unit, size_spec,
+                    main_nom, red_nom, material_grade, full_material_grade, line_number, row_number,
+                    classified_category, classification_confidence, is_verified,
+                    drawing_name, line_no, created_at,
+                    purchase_confirmed, purchase_confirmed_at, purchase_confirmed_by
                 )
                 VALUES (
                     :file_id, :original_description, :quantity, :unit, :size_spec,
                     :main_nom, :red_nom, :material_grade, :full_material_grade, :line_number, :row_number,
                     :classified_category, :classification_confidence, :is_verified,
-                    :drawing_name, :line_no, :created_at
+                    :drawing_name, :line_no, :created_at,
+                    :purchase_confirmed, :purchase_confirmed_at, :purchase_confirmed_by
                 )
                 RETURNING id
             """)
-            
+
             # 첫 번째 자재에 대해서만 디버그 출력
             if materials_inserted == 0:
                 print(f"첫 번째 자재 저장:")
@@ -777,7 +801,8 @@ async def upload_file(
                 print(f"  category: {classification_result.get('category', 'UNCLASSIFIED')}")
                 print(f"  drawing_name: {material_data.get('dwg_name')}")
                 print(f"  line_no: {material_data.get('line_num')}")
-            
+                print(f"  purchase_confirmed: {is_purchase_confirmed}")
+
             material_result = db.execute(material_insert_query, {
                 "file_id": file_id,
                 "original_description": material_data["original_description"],
@@ -795,7 +820,10 @@ async def upload_file(
                 "is_verified": False,
                 "drawing_name": material_data.get("dwg_name"),
                 "line_no": material_data.get("line_num"),
-                "created_at": datetime.now()
+                "created_at": datetime.now(),
+                "purchase_confirmed": is_purchase_confirmed,
+                "purchase_confirmed_at": purchase_confirmed_at,
+                "purchase_confirmed_by": purchase_confirmed_by
             })
             
             material_id = material_result.fetchone()[0]
@@ -4066,12 +4094,12 @@ def perform_simple_revision_comparison(db: Session, job_no: str, parent_file_id:
         }
     """
     try:
-        # 1. 이전 파일의 모든 자재 조회
+        # 1. 이전 파일의 모든 자재 조회 (구매확정 정보 포함)
         previous_materials_query = text("""
             SELECT original_description, classified_category, size_spec, material_grade,
                    main_nom, red_nom, drawing_name, line_no,
                    COALESCE(total_quantity, quantity, 0) as quantity, unit,
-                   purchase_confirmed
+                   purchase_confirmed, purchase_confirmed_at, purchase_confirmed_by
             FROM materials
             WHERE file_id = :parent_file_id
             ORDER BY id
@@ -4111,7 +4139,9 @@ def perform_simple_revision_comparison(db: Session, job_no: str, parent_file_id:
                 "line_no": material.line_no,
                 "quantity": float(material.quantity or 0),
                 "unit": material.unit,
-                "purchase_confirmed": material.purchase_confirmed
+                "purchase_confirmed": material.purchase_confirmed,
+                "purchase_confirmed_at": material.purchase_confirmed_at,
+                "purchase_confirmed_by": material.purchase_confirmed_by
             }
 
             if key in previous_dict:
@@ -4216,6 +4246,7 @@ def perform_simple_revision_comparison(db: Session, job_no: str, parent_file_id:
             "excluded_purchased_count": excluded_purchased_count,
             "materials_to_classify": materials_to_classify,  # 신규 자재만
             "removed_materials": removed_materials,  # 삭제된 자재
+            "purchased_materials_map": purchased_dict,  # 🔥 구매확정된 자재 매핑 정보
             "total_previous": len(previous_dict),
             "total_new": len(new_dict)
         }