In this paper, the deformation and destabilization of cold rolling TC20 alloy bars which were hotrolled at 1000, 940 and 850 ℃, were analyzed and compared. Combined with the microstructure of hotrolled bars and room temperature compression experiments, the result showed that the lower hotrolling temperature, the poorer the coldrolling formability. The bar hotrolled at 850 ℃ possessed the longitudinal microstructure of continuous fibrous αphase, and cold deformation property was poor, about 40%. The bar hotrolled at 1000 ℃ possessed more βphase, the cold deformation reached up to 60%, and showed higher compression rate and lower workhardening rate. The coldrolling formability of TC20 alloy bar had a strong correlation with its room temperature compression performance, the bars with higher compression rate and lower hardening rate in the plastic deformation stage had better cold roll formability.