Gutta-percha was modified by NR/low density polyethylene(LDPE), so a gutta-percha/NR/LDPE were prepared by blend method,and the formula was elected by mechanics performance and shape memory performance as evaluated index. The results showed that the mechanics performance and shape memory performance of modified materials were obviously improved. By comprehensive comparison,the performances of modified materials were optimal when optimal mass ratio of gutta-percha∶NR∶LDPE was 20∶60∶20.