In order to analyze the influence of machine tool feed system of the precision in machining, NC machine tool feed system dynamics model was established by using threedimensional modeling software SolidWorks. The screw and bench model were established using finite element Ansys, the model was introduced into Adams to study the the vibration performance and simulation of NC machine tool feed system.The results show that under the fixed speed,the amplitude of the bench vibration is different at different position, and the rule is almost similar under different speed.At different speeds, the greater the speed, the greater the amplitude of the bench,there appears to be a linear relationship.