Abstract: The low-carbon steel strip containing P and Cu acquired through twin-roll strip casting process, was systematically analyzed by FE-EPMA, SEM, OM as well as constant temperature and humidity testing device. The results indicated that a P-rich layer is formed near the surface of twin-roll cast strip, while the P concentration in the matrix is far lower than the nominal content. After cold-rolling and annealing treatment, the strip containing P and Cu exhibits the better plasticity, and the elongation still keeps above 30% even at P content up to 0.26wt%. Simultaneously, it is far superior in corrosion resistance to that by the conventional process. Especially a dense phosphate layer will be formed on the surface after a certain corrosion time when the P content over 0.15 wt%, which makes the corrosion resistance excellent.