Abstract: The feasibility of hydrogenated mixed C4 with a total olefin content of about 38% as steam cracking material was studied. The selections of hydrogenation catalysts and process conditions were conducted. The composition of cracking product was calculated with the SPYRO software．The economic analysis of the process was examined．The data indicated that Ni containg catalyst NCG is the suitable catalyst, the best reaction conditions are: 60-90 ℃，1.5 MPa，the molar ratio of hydrogen to olefin of 2.0-4.0，the space velocity of fresh liquid feed of 2.0h-1 to 4.0 h-1．The simulation calculation results show that the hydrogenated mixture C4 used as cracking material can achieve good economic benefits of 25.40 million Yuan /a.

Key words: mixed C4, hydrogenation, cracking material, Yield, calculation