Abstract: Effect of compression deformation at temperatures in the solid liquid two phase region on the microstructure and properties of SiC_w/6061Al composites was investigated in the present study.It was found that the aspect ratio and orientation of whisker,densification and uniformity of composites,and interfacial bonding were affected more or less by compression deformation temperature.The properties of composites were affected by the changes of composite microstructure.The changes of composite properties after large deformation which took place at high temperatures were the most important index for evaluating high temperature plastic forming.The best compression deformation parameter was determined by analyzing the microstructure and the properties of composites.