Abstract: The drivers continuos to apperceive and judge moving and static objects outside automobile. To apperceive scope is very important for driving safety. Even though static visual field scope is similar, dynamic visual field scatter being greater. The result shown that static visual field cannot completely reflect practicality visual levels. Test of dynamic visual field for drivers shows significately difference between accidentgroup and non-accident group (p<0.05). Static visual field for drivers don’t exit difference between accident group and non-accident group (p<0.05). It proposes relation between dynamic visual field and maximal safety driving speed.