In order to solve the problem that the traditional fusion algorithm based on DS theory treats all the evidences as high conflict evidences in the process of handling them, this paper proposes an improved algorithm to deal with the high conflict of evidences. We judge the conflicting degrees of evidences firstly, then correcting the high conflict of evidences to reduce them based on the authenticity of original evidences and using DS synthesis rule to fuse the evidences, and then verifying the rationality through the experiment. The results of experiment show that the algorithm we proposed has good convergence and feasibility. Compared with other algorithms, the proposed algorithm can improve the reliability of evidence to some extent in the synthesis process.