Since wireless sensor networks with high redundancy of data characteristics, this article proposes the use of pre-treatment method based on the voting mechanism to reduce the combined operations in the evidence the number of focal element. 针对无线传感器网络中数据具有高冗余性的特点,本文提出了运用基于表决机制的预处理方法来减少参与证据组合运算的焦元个数。