diff --git a/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinEditor.tsx b/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinEditor.tsx
index 8b2d88f8..47902b42 100644
--- a/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinEditor.tsx
+++ b/frontend/components/admin/dashboard/widgets/yard-3d/DigitalTwinEditor.tsx
@@ -73,6 +73,7 @@ export default function DigitalTwinEditor({ layoutId, layoutName, onBack }: Digi
   const [draggedTool, setDraggedTool] = useState<ToolType | null>(null);
   const [draggedAreaData, setDraggedAreaData] = useState<Area | null>(null); // 드래그 중인 Area 정보
   const [draggedLocationData, setDraggedLocationData] = useState<Location | null>(null); // 드래그 중인 Location 정보
+  const [previewPosition, setPreviewPosition] = useState<{ x: number; z: number } | null>(null); // 드래그 프리뷰 위치
   const [isLoading, setIsLoading] = useState(true);
   const [isSaving, setIsSaving] = useState(false);
   const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false);
@@ -832,7 +833,10 @@ export default function DigitalTwinEditor({ layoutId, layoutName, onBack }: Digi
 
   // Location의 자재 목록 로드
   const loadMaterialsForLocation = async (locaKey: string) => {
+    console.log("🔍 자재 조회 시작:", { locaKey, selectedDbConnection, material: hierarchyConfig?.material });
+
     if (!selectedDbConnection || !hierarchyConfig?.material) {
+      console.error("❌ 설정 누락:", { selectedDbConnection, material: hierarchyConfig?.material });
       toast({
         variant: "destructive",
         title: "자재 조회 실패",
@@ -844,10 +848,15 @@ export default function DigitalTwinEditor({ layoutId, layoutName, onBack }: Digi
     try {
       setLoadingMaterials(true);
       setShowMaterialPanel(true);
-      const response = await getMaterials(selectedDbConnection, {
+      
+      const materialConfig = {
         ...hierarchyConfig.material,
         locaKey: locaKey,
-      });
+      };
+      console.log("📡 API 호출:", { externalDbConnectionId: selectedDbConnection, materialConfig });
+      
+      const response = await getMaterials(selectedDbConnection, materialConfig);
+      console.log("📦 API 응답:", response);
       if (response.success && response.data) {
         // layerColumn이 있으면 정렬
         const sortedMaterials = hierarchyConfig.material.layerColumn
@@ -1597,48 +1606,70 @@ export default function DigitalTwinEditor({ layoutId, layoutName, onBack }: Digi
           </div>
         </div>
 
-        {/* 중앙: 3D 캔버스 */}
-        <div
-          className="h-full flex-1 bg-gray-100"
-          onDragOver={(e) => e.preventDefault()}
-          onDrop={(e) => {
-            e.preventDefault();
-            const rect = e.currentTarget.getBoundingClientRect();
-            const rawX = ((e.clientX - rect.left) / rect.width - 0.5) * 100;
-            const rawZ = ((e.clientY - rect.top) / rect.height - 0.5) * 100;
+          {/* 중앙: 3D 캔버스 */}
+          <div className="relative h-full flex-1 bg-gray-100">
+            {isLoading ? (
+              <div className="flex h-full items-center justify-center">
+                <Loader2 className="text-muted-foreground h-8 w-8 animate-spin" />
+              </div>
+            ) : (
+              <>
+                <Yard3DCanvas
+                  placements={placements}
+                  selectedPlacementId={selectedObject?.id || null}
+                  onPlacementClick={(placement) => handleObjectClick(placement?.id || null)}
+                  onPlacementDrag={(id, position) => handleObjectMove(id, position.x, position.z, position.y)}
+                  focusOnPlacementId={null}
+                  onCollisionDetected={() => {}}
+                  previewTool={draggedTool}
+                  previewPosition={previewPosition}
+                  onPreviewPositionUpdate={setPreviewPosition}
+                />
+                {/* 드래그 중일 때 Canvas 위에 투명한 오버레이 (프리뷰 및 드롭 이벤트 캐치용) */}
+                {draggedTool && (
+                  <div
+                    className="pointer-events-auto absolute inset-0"
+                    style={{ zIndex: 10 }}
+                    onDragOver={(e) => {
+                      e.preventDefault();
+                      const rect = e.currentTarget.getBoundingClientRect();
+                      const rawX = ((e.clientX - rect.left) / rect.width - 0.5) * 100;
+                      const rawZ = ((e.clientY - rect.top) / rect.height - 0.5) * 100;
 
-            // 그리드 크기 (5 단위)
-            const gridSize = 5;
+                      // 그리드 크기 (5 단위)
+                      const gridSize = 5;
 
-            // 그리드에 스냅
-            // Area(20x20)는 그리드 교차점에, 다른 객체(5x5)는 타일 중앙에
-            let snappedX = Math.round(rawX / gridSize) * gridSize;
-            let snappedZ = Math.round(rawZ / gridSize) * gridSize;
+                      // 그리드에 스냅
+                      let snappedX = Math.round(rawX / gridSize) * gridSize;
+                      let snappedZ = Math.round(rawZ / gridSize) * gridSize;
 
-            // 5x5 객체는 타일 중앙으로 오프셋 (Area는 제외)
-            if (draggedTool !== "area") {
-              snappedX += gridSize / 2;
-              snappedZ += gridSize / 2;
-            }
+                      // 5x5 객체는 타일 중앙으로 오프셋 (Area는 제외)
+                      if (draggedTool !== "area") {
+                        snappedX += gridSize / 2;
+                        snappedZ += gridSize / 2;
+                      }
 
-            handleCanvasDrop(snappedX, snappedZ);
-          }}
-        >
-          {isLoading ? (
-            <div className="flex h-full items-center justify-center">
-              <Loader2 className="text-muted-foreground h-8 w-8 animate-spin" />
-            </div>
-          ) : (
-            <Yard3DCanvas
-              placements={placements}
-              selectedPlacementId={selectedObject?.id || null}
-              onPlacementClick={(placement) => handleObjectClick(placement?.id || null)}
-              onPlacementDrag={(id, position) => handleObjectMove(id, position.x, position.z, position.y)}
-              focusOnPlacementId={null}
-              onCollisionDetected={() => {}}
-            />
-          )}
-        </div>
+                      setPreviewPosition({ x: snappedX, z: snappedZ });
+                    }}
+                    onDragLeave={() => {
+                      setPreviewPosition(null);
+                    }}
+                    onDrop={(e) => {
+                      e.preventDefault();
+                      e.stopPropagation();
+                      if (previewPosition) {
+                        handleCanvasDrop(previewPosition.x, previewPosition.z);
+                        setPreviewPosition(null);
+                      }
+                      setDraggedTool(null);
+                      setDraggedAreaData(null);
+                      setDraggedLocationData(null);
+                    }}
+                  />
+                )}
+              </>
+            )}
+          </div>
 
         {/* 우측: 객체 속성 편집 or 자재 목록 */}
         <div className="h-full w-[25%] overflow-y-auto border-l">
diff --git a/frontend/components/admin/dashboard/widgets/yard-3d/Yard3DCanvas.tsx b/frontend/components/admin/dashboard/widgets/yard-3d/Yard3DCanvas.tsx
index 3de44b02..cb70b75a 100644
--- a/frontend/components/admin/dashboard/widgets/yard-3d/Yard3DCanvas.tsx
+++ b/frontend/components/admin/dashboard/widgets/yard-3d/Yard3DCanvas.tsx
@@ -35,6 +35,9 @@ interface Yard3DCanvasProps {
   gridSize?: number; // 그리드 크기 (기본값: 5)
   onCollisionDetected?: () => void; // 충돌 감지 시 콜백
   focusOnPlacementId?: number | null; // 카메라가 포커스할 요소 ID
+  previewTool?: string | null; // 드래그 중인 도구 타입
+  previewPosition?: { x: number; z: number } | null; // 프리뷰 위치
+  onPreviewPositionUpdate?: (position: { x: number; z: number } | null) => void;
 }
 
 // 좌표를 그리드 칸의 중심에 스냅 (마인크래프트 스타일)
@@ -1007,10 +1010,26 @@ function Scene({
   gridSize = 5,
   onCollisionDetected,
   focusOnPlacementId,
+  previewTool,
+  previewPosition,
 }: Yard3DCanvasProps) {
   const [isDraggingAny, setIsDraggingAny] = useState(false);
   const orbitControlsRef = useRef<any>(null);
 
+  // 프리뷰 박스 크기 계산
+  const getPreviewSize = (tool: string) => {
+    if (tool === "area") return { x: 20, y: 0.1, z: 20 };
+    return { x: 5, y: 5, z: 5 };
+  };
+
+  // 프리뷰 박스 색상
+  const getPreviewColor = (tool: string) => {
+    if (tool === "area") return "#3b82f6";
+    if (tool === "location-bed") return "#10b981";
+    if (tool === "location-stp") return "#f59e0b";
+    return "#9ca3af";
+  };
+
   return (
     <>
       {/* 카메라 포커스 컨트롤러 */}
@@ -1069,6 +1088,30 @@ function Scene({
         />
       ))}
 
+      {/* 드래그 프리뷰 박스 */}
+      {previewTool && previewPosition && (
+        <Box
+          args={[
+            getPreviewSize(previewTool).x,
+            getPreviewSize(previewTool).y,
+            getPreviewSize(previewTool).z,
+          ]}
+          position={[
+            previewPosition.x,
+            previewTool === "area" ? 0.05 : getPreviewSize(previewTool).y / 2,
+            previewPosition.z,
+          ]}
+        >
+          <meshStandardMaterial
+            color={getPreviewColor(previewTool)}
+            transparent
+            opacity={0.4}
+            roughness={0.5}
+            metalness={0.1}
+          />
+        </Box>
+      )}
+
       {/* 카메라 컨트롤 */}
       <OrbitControls
         ref={orbitControlsRef}
@@ -1095,6 +1138,9 @@ export default function Yard3DCanvas({
   gridSize = 5,
   onCollisionDetected,
   focusOnPlacementId,
+  previewTool,
+  previewPosition,
+  onPreviewPositionUpdate,
 }: Yard3DCanvasProps) {
   const handleCanvasClick = (e: any) => {
     // Canvas의 빈 공간을 클릭했을 때만 선택 해제
@@ -1123,6 +1169,8 @@ export default function Yard3DCanvas({
             gridSize={gridSize}
             onCollisionDetected={onCollisionDetected}
             focusOnPlacementId={focusOnPlacementId}
+            previewTool={previewTool}
+            previewPosition={previewPosition}
           />
         </Suspense>
       </Canvas>