For the problem of headtail rolling force and thickness fluctuation in the process of producing high silicon DP780 dual phase steel by PL-TCM, the whole production process and steel structure and property characteristics were studied. The research shows that the inconsistent temperature uniformity of hot rolling head and tail results in the uneven distribution of strip head and tail properties as well as acid rolling force fluctuation. By adopting the Utype cooling method in the coiling process for the hot rolling operation, the coiling temperature of head and tail for DP780 dual phase steel is increased, and the cooling difference among the head, tail and belt body in the coiling process of hot rolled steel is reduced. Thus, the rolling force and thickness fluctuation phenomenon of automobile highstrength steel in the acid continuous rolling process are effectively improved. Compared with the original process, the rolling force of head and tail for high silicon DP780 dual phase steel is reduced by about 2500 kN, and the rolling force stability is obviously improved. Furthermore, the thickness fluctuation of head and tail is obviously improved, and the production efficiency is improved effectively.