By using natural gutta-percha that substitutes part of natural rubber(NR)to produce mixed rubber through blending with butadiene rubber(BR),this paper studied some kinds of influences on physical mechanical property during the processing,such as the temperature of vulcanizate,the time of vulcanizate,the amount of vul- canization agents and accelerant.The results showed that the amount of curing agent(S)was no more than 3 phr and the blend with accelerant was made at the temperature of 150℃for twenty minutes...