diff --git a/src/nc/ncBuilder.ts b/src/nc/ncWriter.ts
similarity index 94%
rename from src/nc/ncBuilder.ts
rename to src/nc/ncWriter.ts
index 19682fd..420f7aa 100644
--- a/src/nc/ncBuilder.ts
+++ b/src/nc/ncWriter.ts
@@ -73,6 +73,13 @@ export class GCodeParams {
     f: number = 0;
 };
 
+/** 单次NC加工行为 */
+export interface NcAction {
+    readonly id: string;
+    readonly type: NcActionType;
+    readonly lineIndex: number;
+}
+
 export type NcActionType = string;
 
 /**
@@ -81,7 +88,9 @@ export type NcActionType = string;
  * @since 0.3.0
  * @version 0.1.0
  */
-export interface INcBuilder {
+export interface INcWriter {
+    get ncActions(): NcAction[];
+
     /** 添加G代码 */
     gCode(code: keyof typeof GCode, params: Partial<Pick<GCodeParams, 'x' | 'y' | 'z' | 'f'> & { bul: number; }>): void;