diff --git a/src/brick/index.ts b/src/brick/index.ts
index 83bda46..4efb335 100644
--- a/src/brick/index.ts
+++ b/src/brick/index.ts
@@ -1,26 +1,27 @@
 import { drawBrick } from "../draw"
 import { gameParam } from "../gameConfig"
-import {
-  BinaryString,
-  BrickColor,
-  BrickStruct,
-  Bricks,
-  IBrick,
-} from "../types/brick"
+import { BrickColor, BrickStruct, Bricks, IBrick } from "../types/brick"
 import { bricks } from "./brickConfig"
 
-const getY = (structure: BinaryString<BrickStruct>) => {
-  const index = structure.findLastIndex((s) => +s !== 0)
+const getY = (structure: Readonly<number[]>) => {
+  const index = structure.findLastIndex((s) => s !== 0)
   if (index === -1) return -structure.length
   return -index - 1
 }
+
+const getStructureVal = (structure: BrickStruct): number[] => {
+  return structure.map((s) => parseInt(s, 2))
+}
+
+const eliminateTarget = 2 ** gameParam.column - 1
+
 export class Brick implements IBrick {
   static readonly height = gameParam.brickHeight
   static readonly width = gameParam.brickWidth
   readonly color: BrickColor
   readonly width: number
   readonly height: number
-  structure: BinaryString<BrickStruct>
+  structure: Readonly<number[]>
   x: number
   y: number
   isRecycle = false
@@ -31,7 +32,7 @@ export class Brick implements IBrick {
     this.color = bricks[this.letter].color
     this.width = Brick.width
     this.height = Brick.height
-    this.structure = bricks[this.letter].struct
+    this.structure = getStructureVal(bricks[this.letter].struct)
     this.x = gameParam.column / 2 - 1
     this.y = getY(this.structure)
   }
@@ -86,49 +87,42 @@ export class Brick implements IBrick {
     return true
   }
   rotate(mapBinary: number[]) {
-    const len = this.structure[0].length
-    let newStructure: string[][] | BinaryString<BrickStruct> = Array.from(
-      { length: len },
-      () => new Array(len)
-    )
-    for (let i = 0; i < this.structure.length; i++) {
-      for (let j = 0; j < this.structure[i].length; j++) {
-        let x = i,
-          y = len - 1 - j
+    const len = this.structure.length
+    const newStructure: number[] = new Array(len).fill(0)
+    let i = 0,
+      j = 0
+    while (i < len) {
+      if (this.structure[i] & (1 << (len - 1 - j))) {
+        const x = i
+        const y = len - 1 - j
+        //边界检测
         if (
-          this.structure[i][j] === "1" &&
-          (x + this.x >= gameParam.column ||
-            x + this.x < 0 ||
-            y + this.y >= gameParam.row)
-        )
+          x + this.x >= gameParam.column ||
+          x + this.x < 0 ||
+          y + this.y >= gameParam.row
+        ) {
           return
-        newStructure[y][x] = this.structure[i][j]
+        }
+        newStructure[y] += 1 << (len - 1 - x)
+      }
+      j++
+      if (j === len) {
+        i++
+        j = 0
       }
     }
-    newStructure = newStructure.map((s) =>
-      s.join("")
-    ) as unknown as BinaryString<BrickStruct>
     const newBinary = this.getBinary(newStructure)
     if (this.isOverlap(mapBinary, newBinary)) return
     this.structure = newStructure
   }
-  getBinary(
-    structure: BinaryString<BrickStruct> = this.structure,
-    x: number = this.x
-  ) {
-    const binary: number[] = []
-    const len = structure[0].length
-    const carry = gameParam.column - x - len
-    for (let i = len - 1; i >= 0; i--) {
-      let r
+  getBinary(structure = this.structure, x: number = this.x) {
+    const carry = gameParam.column - x - structure.length
+    return structure.map((v) => {
       if (carry >= 0) {
-        r = parseInt(structure[i], 2) << carry
-      } else {
-        r = parseInt(structure[i], 2) >> -carry
+        return v << carry
       }
-      binary.unshift(r)
-    }
-    return binary
+      return v >> -carry
+    })
   }
   correctLastTime(time: number) {
     this.lastTime = time
@@ -157,7 +151,8 @@ export class Brick implements IBrick {
     }
     for (let i = binary.length - 1; i >= 0; i--) {
       if (y + i < 0) continue
-      if (binary[i] & (mapBinary[y + i] ?? 2 ** gameParam.column - 1)) {
+      //mapBinary[y + i] 可能的情况为0 或者 undefined(因为brick.structure有全0排列)
+      if (binary[i] & (mapBinary[y + i] ?? eliminateTarget)) {
         return true
       }
     }
@@ -170,7 +165,7 @@ export class Brick implements IBrick {
    */
   private isAtBorder(direction: "left" | "right") {
     const binary = this.getBinary()
-    const maxBorderBinaryValue = { left: 2 ** (gameParam.column - 1), right: 1 }
+    const maxBorderBinaryValue = { left: (eliminateTarget + 1) / 2, right: 1 }
     for (let i = binary.length - 1; i >= 0; i--) {
       if (binary[i] & maxBorderBinaryValue[direction]) {
         return true
diff --git a/src/draw/index.ts b/src/draw/index.ts
index 201942a..6dcaee1 100644
--- a/src/draw/index.ts
+++ b/src/draw/index.ts
@@ -5,9 +5,10 @@ export const drawBrick = (
   ctx: CanvasRenderingContext2D,
   { x, y, width, height, color, structure }: IBrick
 ) => {
-  for (let i = 0; i < structure.length; i++) {
-    for (let j = 0; j < structure[i].length; j++) {
-      if (structure[i][j] == "0") continue
+  let i = 0,
+    j = 0
+  while (i < structure.length) {
+    if (structure[i] & (1 << (structure.length - 1 - j))) {
       drawBrickPiece(ctx, {
         x: (x + j) * width,
         y: (y + i) * height,
@@ -16,7 +17,10 @@ export const drawBrick = (
         color,
       } as IBrick)
     }
+    j++
+    if (j === structure.length) {
+      j = 0
+      i++
+    }
   }
 }
-
-
diff --git a/src/types/brick.ts b/src/types/brick.ts
index f40eb19..433f972 100644
--- a/src/types/brick.ts
+++ b/src/types/brick.ts
@@ -1,74 +1,70 @@
-import { Binary, isBinaryString } from "./helper";
-
-
-export type BinaryString<T extends BrickStruct> = {
-  [K in keyof T]: isBinaryString<T[K]>;
-};
-// type a = BinaryString<("00" | "10" | "01" | "11")[]>
+export type Binary<
+  T extends number,
+  R extends string = "",
+  Arr extends string[] = []
+> = Arr["length"] extends T ? R : Binary<T, `${R}${"0" | "1"}`, [...Arr, ""]>
 
 export type Struct<
   T extends number,
   R extends any[] = []
-> = R["length"] extends T ? R : Struct<T, [...R, Binary<T>]>;
+> = R["length"] extends T ? R : Struct<T, [...R, Binary<T>]>
 
-export type BrickLetter = keyof Bricks;
-
-export type BrickColor = Bricks[BrickLetter]["color"];
-
-export type BrickStruct = Bricks[BrickLetter]["struct"];
+export type BrickLetter = keyof Bricks
 
+export type BrickColor = Bricks[BrickLetter]["color"]
 
+export type BrickStruct = Bricks[BrickLetter]["struct"]
 
 export type Bricks = {
   [key: string]: {
-    color: string;
-    struct: Readonly<Struct<1> | Struct<2> | Struct<3> | Struct<4>>;
-  };
+    color: string
+    struct: Readonly<Struct<1> | Struct<2> | Struct<3> | Struct<4>>
+  }
   o: {
-    color: "#FADADD";
-    struct: Readonly<Struct<2>>;
-  };
+    color: "#FADADD"
+    struct: Readonly<Struct<2>>
+  }
   i: {
-    color: "#F7E9D4";
-    struct: Readonly<Struct<4>>;
-  };
+    color: "#F7E9D4"
+    struct: Readonly<Struct<4>>
+  }
   s: {
-    color: "#C8E6C9";
-    struct: Readonly<Struct<3>>;
-  };
+    color: "#C8E6C9"
+    struct: Readonly<Struct<3>>
+  }
   z: {
-    color: "#B3E5FC";
-    struct: Readonly<Struct<3>>;
-  };
+    color: "#B3E5FC"
+    struct: Readonly<Struct<3>>
+  }
   l: {
-    color: "#FFCC80";
-    struct: Readonly<Struct<3>>;
-  };
+    color: "#FFCC80"
+    struct: Readonly<Struct<3>>
+  }
   j: {
-    color: "#FFEE58";
-    struct: Readonly<Struct<3>>;
-  };
+    color: "#FFEE58"
+    struct: Readonly<Struct<3>>
+  }
   t: {
-    color: "#CE93D8";
-    struct: Readonly<Struct<3>>;
-  };
-};
+    color: "#CE93D8"
+    struct: Readonly<Struct<3>>
+  }
+}
 
 export interface IBrick {
-  letter: BrickLetter;
-  x: number;
-  y: number;
-  width: number;
-  height: number;
-  color: BrickColor;
-  structure: BinaryString<BrickStruct>;
-  isRecycle: boolean;
-  draw(ctx: CanvasRenderingContext2D): void;
-  update(time: number, mapBinary: number[]): boolean;
-  getBinary(): number[];
-  left(mapBinary: number[]): void;
-  right(mapBinary: number[]): void;
-  downOne(mapBinary: number[]): boolean;
-  downToBottom(mapBinary: number[]): boolean;
-  rotate(mapBinary: number[]): void;
+  letter: BrickLetter
+  x: number
+  y: number
+  width: number
+  height: number
+  color: BrickColor
+  structure: Readonly<number[]>
+  isRecycle: boolean
+  draw(ctx: CanvasRenderingContext2D): void
+  update(time: number, mapBinary: number[]): boolean
+  getBinary(): number[]
+  left(mapBinary: number[]): void
+  right(mapBinary: number[]): void
+  downOne(mapBinary: number[]): boolean
+  downToBottom(mapBinary: number[]): boolean
+  rotate(mapBinary: number[]): void
 }
diff --git a/src/types/helper.ts b/src/types/helper.ts
deleted file mode 100644
index 556924c..0000000
--- a/src/types/helper.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-export type NoneBinary<T extends string, _T = T> = T extends `${"1" | "0"}${infer R}`
-  ? NoneBinary<R>
-  : T extends ""
-  ? _T
-  : never
-
-export type isBinaryString<T extends string> = NoneBinary<T> extends never ? never : T
-
-export type Binary<
-  T extends number,
-  R extends string = "",
-  Arr extends string[] = []
-> = Arr["length"] extends T ? R : Binary<T, `${R}${"0" | "1"}`, [...Arr, ""]>
-
-// export type OptionalKeys<T> = {
-//   [K in keyof T]-?: {} extends Pick<T, K> ? K : never
-// }[keyof T]
\ No newline at end of file