Abstract: In order to solve the problem of frequent failure on the sand pump sets, the difference analysis between the platform electric system and the motor parameters was executed by the detailed phenomenon and consequences study, the result of which shows the key internal reason is the unreasonable motor parameters selection. As consequence, the measures with the theoretical basis that reduces the size of impeller were applied. The sand pump sets run stably with the most economical cost. By this practice, the modified measure can provide reference for solving similar failure in fields.