Abstract: Tow TP439 strip steels with same thickness，different chemical compositions and made with different manufacturing processes are used to produce the products with the same size via the same cold-bending formation process. The key factors as affecting the cold-bending forming performance of the TP439 strip steel，i.e.，the chemical composition and the finish-rolling temperature are identified by means of testing and analyzing the metallographic structure，the residual stress（via the C Type Method），the tensile property and the hardness，etc. Comparatively Elements C and N in the chemical composition produces more obvious influences mainly on the hardness，the strength and the elongation of the strip steel， while the finish-rolling temperature mainly affects the grain size；and the low hardness，the low yield strength，the high elongation and the fine grain size of the strip steel are helpful for cold-bending formation of the strip steel. The result of the above mentioned analyses is worth using as the guide for controlling the performance of the strip steel for cold-bending formation purpose.