diff --git a/frontend/components/common/EditableSpreadsheet.tsx b/frontend/components/common/EditableSpreadsheet.tsx
index 17c8ce94..67e7f80b 100644
--- a/frontend/components/common/EditableSpreadsheet.tsx
+++ b/frontend/components/common/EditableSpreadsheet.tsx
@@ -822,7 +822,43 @@ export const EditableSpreadsheet: React.FC<EditableSpreadsheetProps> = ({
     }
   }, [isDraggingFill, selection]);
 
+  // 열의 숫자 패턴 간격 계산 (예: 201, 202 → 간격 1)
+  const calculateColumnIncrement = (colIndex: number, startRow: number, endRow: number): number | null => {
+    if (startRow === endRow) return 1; // 단일 행이면 기본 증가 1
+    
+    const colName = columns[colIndex];
+    const increments: number[] = [];
+    
+    for (let row = startRow; row < endRow; row++) {
+      const currentValue = String(data[row]?.[colName] ?? "");
+      const nextValue = String(data[row + 1]?.[colName] ?? "");
+      
+      const currentPattern = extractNumberPattern(currentValue);
+      const nextPattern = extractNumberPattern(nextValue);
+      
+      if (currentPattern && nextPattern) {
+        // 접두사와 접미사가 같은지 확인
+        if (currentPattern.prefix === nextPattern.prefix && currentPattern.suffix === nextPattern.suffix) {
+          increments.push(nextPattern.number - currentPattern.number);
+        } else {
+          return null; // 패턴이 다르면 복사 모드
+        }
+      } else {
+        return null; // 숫자 패턴이 없으면 복사 모드
+      }
+    }
+    
+    // 모든 간격이 같은지 확인
+    if (increments.length > 0 && increments.every(inc => inc === increments[0])) {
+      return increments[0];
+    }
+    
+    return null;
+  };
+
   // 자동 채우기 드래그 종료 (다중 셀 지원)
+  // - 숫자 패턴이 있으면: 패턴 간격을 인식하여 증가 (201, 202 → 203, 204)
+  // - 숫자 패턴이 없으면: 선택된 패턴 그대로 반복 (복사)
   const handleFillDragEnd = useCallback(() => {
     if (!isDraggingFill || !selection || fillPreviewEnd === null) {
       setIsDraggingFill(false);
@@ -836,15 +872,16 @@ export const EditableSpreadsheet: React.FC<EditableSpreadsheetProps> = ({
 
     if (endRow !== norm.endRow && norm.startRow >= 0) {
       const newData = [...data];
+      
+      // 각 열별로 증가 패턴 계산
+      const columnIncrements: Map<number, number | null> = new Map();
+      for (let col = norm.startCol; col <= norm.endCol; col++) {
+        columnIncrements.set(col, calculateColumnIncrement(col, norm.startRow, norm.endRow));
+      }
 
       if (endRow > norm.endRow) {
         // 아래로 채우기
         for (let targetRow = norm.endRow + 1; targetRow <= endRow; targetRow++) {
-          // 선택 범위 내 행 순환
-          const sourceRowOffset = (targetRow - norm.startRow) % selectionHeight;
-          const sourceRow = norm.startRow + sourceRowOffset;
-          const stepMultiplier = Math.floor((targetRow - norm.startRow) / selectionHeight);
-          
           if (!newData[targetRow]) {
             newData[targetRow] = {};
             columns.forEach((c) => {
@@ -855,20 +892,32 @@ export const EditableSpreadsheet: React.FC<EditableSpreadsheetProps> = ({
           // 선택된 모든 열에 대해 채우기
           for (let col = norm.startCol; col <= norm.endCol; col++) {
             const colName = columns[col];
-            const sourceValue = String(data[sourceRow]?.[colName] ?? "");
-            const step = targetRow - sourceRow;
-            newData[targetRow] = {
-              ...newData[targetRow],
-              [colName]: generateNextValue(sourceValue, step),
-            };
+            const increment = columnIncrements.get(col);
+            
+            if (increment !== null) {
+              // 숫자 패턴 증가 모드
+              // 마지막 선택 행의 값을 기준으로 증가
+              const lastValue = String(data[norm.endRow]?.[colName] ?? "");
+              const step = (targetRow - norm.endRow) * increment;
+              newData[targetRow] = {
+                ...newData[targetRow],
+                [colName]: generateNextValue(lastValue, step),
+              };
+            } else {
+              // 복사 모드 (패턴 반복)
+              const sourceRowOffset = (targetRow - norm.endRow - 1) % selectionHeight;
+              const sourceRow = norm.startRow + sourceRowOffset;
+              const sourceValue = String(data[sourceRow]?.[colName] ?? "");
+              newData[targetRow] = {
+                ...newData[targetRow],
+                [colName]: sourceValue,
+              };
+            }
           }
         }
       } else if (endRow < norm.startRow) {
         // 위로 채우기
         for (let targetRow = norm.startRow - 1; targetRow >= endRow; targetRow--) {
-          const sourceRowOffset = (norm.startRow - targetRow - 1) % selectionHeight;
-          const sourceRow = norm.endRow - sourceRowOffset;
-          
           if (!newData[targetRow]) {
             newData[targetRow] = {};
             columns.forEach((c) => {
@@ -878,12 +927,26 @@ export const EditableSpreadsheet: React.FC<EditableSpreadsheetProps> = ({
 
           for (let col = norm.startCol; col <= norm.endCol; col++) {
             const colName = columns[col];
-            const sourceValue = String(data[sourceRow]?.[colName] ?? "");
-            const step = targetRow - sourceRow;
-            newData[targetRow] = {
-              ...newData[targetRow],
-              [colName]: generateNextValue(sourceValue, step),
-            };
+            const increment = columnIncrements.get(col);
+            
+            if (increment !== null) {
+              // 숫자 패턴 감소 모드
+              const firstValue = String(data[norm.startRow]?.[colName] ?? "");
+              const step = (targetRow - norm.startRow) * increment;
+              newData[targetRow] = {
+                ...newData[targetRow],
+                [colName]: generateNextValue(firstValue, step),
+              };
+            } else {
+              // 복사 모드 (패턴 반복)
+              const sourceRowOffset = (norm.startRow - targetRow - 1) % selectionHeight;
+              const sourceRow = norm.endRow - sourceRowOffset;
+              const sourceValue = String(data[sourceRow]?.[colName] ?? "");
+              newData[targetRow] = {
+                ...newData[targetRow],
+                [colName]: sourceValue,
+              };
+            }
           }
         }
       }