diff --git a/src/cfg/RoomOptions.ts b/src/cfg/RoomOptions.ts
index 73712ad..3af46cf 100644
--- a/src/cfg/RoomOptions.ts
+++ b/src/cfg/RoomOptions.ts
@@ -1,6 +1,7 @@
 import { singleton } from '../decorators/singleton.decorator'
 import { GameEnv } from './GameEnv'
 import { CardGameState } from '../rooms/schema/CardGameState'
+import { checkBitIdx, checkBitNumber } from '../utils/number.util'
 
 /**
  * 一个回合是否能多次吃牌
@@ -66,11 +67,18 @@ export class RoomOptions {
     return 0
   }
 
-  public initGameRule(state: CardGameState) {
-    state.rules.set(RULE_CANEAT, this.canEat({advMode: state.advMode}))
-    state.rules.set(RULE_MULTIPLEEAT, this.multipleEat())
-    state.rules.set(RULE_DROPCARD, this.autoDiscard())
-    state.rules.set(RULE_SINGLEEAT, this.singleEat())
+  public initGameRule(state: CardGameState, val: number) {
+    if (val) {
+      state.rules.set(RULE_CANEAT, checkBitNumber(val, 1))
+      state.rules.set(RULE_MULTIPLEEAT, checkBitNumber(val, 2))
+      state.rules.set(RULE_DROPCARD, checkBitNumber(val, 3))
+      state.rules.set(RULE_SINGLEEAT, checkBitNumber(val, 4))
+    } else {
+      state.rules.set(RULE_CANEAT, this.canEat({advMode: state.advMode}))
+      state.rules.set(RULE_MULTIPLEEAT, this.multipleEat())
+      state.rules.set(RULE_DROPCARD, this.autoDiscard())
+      state.rules.set(RULE_SINGLEEAT, this.singleEat())
+    }
   }
 
 }
diff --git a/src/rooms/GeneralRoom.ts b/src/rooms/GeneralRoom.ts
index ad74070..a60fe42 100644
--- a/src/rooms/GeneralRoom.ts
+++ b/src/rooms/GeneralRoom.ts
@@ -61,7 +61,11 @@ export class GeneralRoom extends Room {
     if (options.score) {
       this.score = options.score
     }
-    new RoomOptions().initGameRule(this.state)
+    let val = 0
+    if (options.debug_cv) {
+      val = +options.debug_cv
+    }
+    new RoomOptions().initGameRule(this.state, val)
     this.battleMan.init(cs, this)
     this.clock.start()
     this.state.gameState = GameStateConst.STATE_WAIT_JOIN
diff --git a/src/utils/number.util.ts b/src/utils/number.util.ts
index 592b2df..ac838de 100644
--- a/src/utils/number.util.ts
+++ b/src/utils/number.util.ts
@@ -8,3 +8,20 @@ export function getRandom(max: number, min: number): number {
   min = min || 0;
   return Math.floor(Math.random()*(max-min)+min);
 }
+
+export function setBitVal(value: number, index: number, yes: boolean) {
+  if (yes) {
+    value |= (1<<index)
+  } else {
+    value &= ~(1<<index)
+  }
+  return value
+}
+
+export function checkBitIdx(value: number, index: number): boolean {
+  return  ((value >> (index)) & 1 ) == 1
+}
+
+export function checkBitNumber(value: number, index: number): number {
+  return  (((value >> (index)) & 1 ) == 1) ? 1 : 0
+}