In order to solve the uneven wear problem of frictional disks of HVD clutch and improve its response speed, a new HVD clutch with double piston structure is proposed, and its working principle is analyzed. Based on mathematics model of frictional disks, the oil dynamic balance function and transfer function for the new HVD clutch are obtained, and its dynamic characteristics is studied by theory analysis and simulation. The results show that compared with the ordinary HVD clutch with singular piston, the new HVD clutch has a faster response speed. The response time can reduce from 52s to 22s when the output speed is given as 80rad/s.