diff --git a/packages/rrreol-core/src/judge.js b/packages/rrreol-core/src/judge.js
index 6c9b72a..5097a0b 100644
--- a/packages/rrreol-core/src/judge.js
+++ b/packages/rrreol-core/src/judge.js
@@ -17,7 +17,8 @@ export class Judge extends EventEmitter {
     const {
       input = [],
       output = [],
-      file = isString(props) ? props : null
+      file = isString(props) ? props : null,
+      ignoreEndEnter = true
     } = props
 
     this.__outputs = output.map((val) => {
@@ -27,6 +28,13 @@ export class Judge extends EventEmitter {
       return new FileManager(val)
     })
     this.__answer = []
+    this.__config = Object.assign({
+      ignoreEndEnter: true // if ignore the `\n` at the line end
+    }, {
+      ignoreEndEnter
+    })
+
+    this.__task = []
 
     this.__path = file || null
     this.__target = 0
@@ -34,6 +42,7 @@ export class Judge extends EventEmitter {
     this.on('start', this.exec)
     this.on('finished', () => {
       // todo
+      console.log(chalk.greenBright('finished'))
     })
   }
 
@@ -83,9 +92,10 @@ export class Judge extends EventEmitter {
     if (isNil(this.__outputs[this.__target])) {
       console.log(chalk.red('error') + 'target file is empty')
     } else if (isString(val)) {
+      // todo
       findIndex(propEq('name', val))(this.__outputs)
     }
-    this.__target = val
+    this.__target = val - 1
     return this
   }
 
@@ -105,16 +115,67 @@ export class Judge extends EventEmitter {
     const path = await Compiler.compile(this.__path, outputPath)
     console.log(`${chalk.yellowBright('Compiled')} file`)
     const runner = new Runner(path)
+
+    let index = 0
     for await (const input of this.__inputs) {
       const res = await runner.execUnsafe(input)
-      const fm = FileManager.of().loadContent(res)
-      this.__answer.push(fm)
-      this.emit('finished', fm)
+      const fileManager = FileManager.of().loadContent(res)
+      this.__answer.push(fileManager)
+      // check output
+      const success = this.compareFileManager(fileManager, this.out(index + 1))
+      if (!success) {
+        console.log(`${chalk.red('error on file')} ${index + 1}`)
+      }
+
+      ++index
     }
     return this
   }
 
+  compareFileManager = (realFM, expectedFM) => {
+    if (!(realFM instanceof FileManager) ||
+      !(expectedFM instanceof FileManager)) {
+      throw new TypeError()
+    }
+    let success = true
+    Object.keys(Array(realFM.lines())).forEach((_, line) => {
+      const realLine = realFM.line(++line)
+      const expectedLine = expectedFM.line(line)
+      const same = equals(realLine, expectedLine)
+      if (!same) {
+        success = false
+        // todo: support log column
+        console.log(`${chalk.red('wrong answer: On line')} ${line}, read ${realLine} expected ${expectedLine}`)
+      }
+    })
+    return success
+  }
+
   run = () => this.emit('start')
+
+  line = (line) => {
+    return JudgeWrapper.of.call(this, curry((val) => {
+      return equals(this.targetFile.line(line), val)
+    }))
+  }
+
+  lines = () => {
+    return JudgeWrapper.of.call(this, curry((val) => {
+      return this.targetFile.lines() === val
+    }))
+  }
+
+  maxline = () => {
+    return JudgeWrapper.of.call(this, curry((val) => {
+      return this.targetFile.lines() <= val
+    }))
+  }
+
+  minline = () => {
+    return JudgeWrapper.of.call(this, curry((val) => {
+      return this.targetFile.lines() >= val
+    }))
+  }
 }
 
 export default Judge
diff --git a/packages/rrreol-core/src/judgeWrapper.js b/packages/rrreol-core/src/judgeWrapper.js
index f193f36..77dc1f0 100644
--- a/packages/rrreol-core/src/judgeWrapper.js
+++ b/packages/rrreol-core/src/judgeWrapper.js
@@ -8,19 +8,17 @@ export class JudgeWrapper {
     return new JudgeWrapper(val, this)
   }
 
-  constructor (val, target) {
-    if (isNil(val)) {
+  constructor (fn, target) {
+    if (isNil(fn)) {
       throw TypeError('val is null')
     }
     this.__target = target || null
-    this.__val = val
+    this.__fn = fn
   }
 
   toBe = (val) => {
     if ('on' in this.__target) {
-      this.__target.on('finished', (answer) => {
-
-      })
+      this.__target.on('finished', () => this.__fn(val))
     } else {
       throw new Error('no property \'on\'')
     }
diff --git a/packages/rrreol-core/test/unit/judge.test.js b/packages/rrreol-core/test/unit/judge.test.js
index 95879aa..9d2d021 100644
--- a/packages/rrreol-core/test/unit/judge.test.js
+++ b/packages/rrreol-core/test/unit/judge.test.js
@@ -10,6 +10,10 @@ describe('Judge base test', () => {
     judge = new Judge()
   })
 
+  it('should have correct props', () => {
+    expect(judge.__config.ignoreEndEnter).toBe(true)
+  })
+
   it('should throw error when invoke get method', () => {
     expect(() => {
       judge.targetFile = 1
@@ -64,7 +68,42 @@ describe('Judge check test', () => {
     expect(judge.answer(1).content).toEqual('1 2')
   })
 
+  it('should emit check running success', () => {
+    const fm1 = FileManager.of().loadContent('1\n2\n')
+    const fm2 = FileManager.of().loadContent('1\n2\n')
+    judge.rawListeners('check')
+      .map(f => f(fm1, fm2))
+      .every(v => expect(v).toBeTruthy())
+  })
+
   afterAll(() => {
     removeFiles(fixturesPath, /\.test\.out$/)
   })
 })
+
+describe('Judge check park', () => {
+  let judge = null
+  beforeEach(() => {
+    judge = new Judge()
+  })
+
+  it('should get the correct line content', () => {
+    judge.in(1).loadContent('1\n2\n3')
+    judge.out(1).loadContent('4\n5\n6')
+    judge.line(1).toBe('1')
+    judge.line(2).toBe('2')
+    judge.line(3).toBe('3')
+    // judge.exec()
+    judge.emit('finished')
+  })
+
+  it('should get the correct max/min line content', () => {
+    judge.in(1).loadContent('1\n2\n3')
+    judge.out(1).loadContent('4\n5\n6')
+    judge.lines().toBe(3)
+    judge.maxline().toBe(4)
+    judge.minline().toBe(1)
+    // judge.exec()
+    judge.emit('finished')
+  })
+})