Crystallization of natural rubber(NR) was investigated in different morphology for NR/styrene butadiene rubber(SBR) blend and NR/polystyrene-(b)-polyisoprene(SI)/polystyrene(PS) blend. A purified NR(PC-TE) was prepared from pale crape via transesterification. In the blends, PC-TE formed various morphologies; that is, matrix phase, island phase and continuous phase with a nano-scale, respectively, in dependence upon the ratio of the rubbers. The crystallization rate of the blends was also significantly associated with the morphology of the rubbers. Crystallization of natural rubber (NR) was investigated in different morphology for NR / styrene butadiene rubber (SBR) blend and NR / polystyrene- (b) -polyisoprene (SI) was prepared from pale crape via transesterification. In the blends, PC-TE formed various morphologies; that is, matrix phase, island phase and continuous phase with a nano-scale, respectively, in dependence upon the ratio of the rubbers. The crystallization rate of the blends was also significantly associated with the morphology of the rubbers.