This paper discussed the influence of the pertinence of two couples of physical parameters on the uncertainty of particle velocity and the shock pressure of test sample. The influence was estimated f rom calculation of experimental data. By a great deal of experimental statistic data, the influence of the pertinence of Hugoniot parameters on the uncertainty of particle velocity was less than 0.7‰, and the influence of the pertinence of physical parameters shock velocity and particle velocity on the uncertainty of shock pressure was about 0.5%