Abstract: Melting and gasification behavior of Ca Al cored wire with 0.74-mm steel sheet and better feeding process in 1873 K molten steel in 150 t ladle was simulated, and the influence of different Ca cored wire and composition of liquid steel on Ca recovery were analyzed.The results show that calcium alloy of Ca Al cored wire has smelted before its covering steel sheet melts when cored wire is fed into molten steel, melting time of Ca Al cored wire is 0.92 s, then liquid Ca alloy diffuses into liquid steel.Liquid Ca alloy floats upward to 1.22 m below the liquid steel surface and gasifies when alloy has get enough steam pressure of gasification.The feeding speed of 3.22-4.83 m·s^-1for Ca Al cored wire is appropriate to get ideal feeding depth of 2.96 m in ladle with liquid steel.When the elements contents of carbon, silicon and manganese in liquid steel are high, pure Ca cored wire should be used to get bigger Ca recovery, on the contrary, Ca Al cored wire is a better option for low carbon liquid steel with low elements contents of silicon and manganese.