Abstract: The temperature field model of high-frequency induction cladding copper alloy on the inner wall of hydraulic cylinder was established by using the electromagnetic thermal coupling technology of finite element method. The distribution and influence factors of the temperature field were studied. The performance parameters such as metallurgical joint,microstructure observation and hardness were verified by the actual induction cladding test. The results show that in the process of induction cladding copper alloy, the current, frequency and induction heating time have obvious effects on the temperature field distribution of high frequency induction cladding copper alloy on the inner wall of cylinder. Under the working conditions of 3500 A current, 200 KHz frequency and 4 s heating time, the thermal impact on the cylinder barrel matrix is minimal, the metallurgical bonding between the cladding layer and the matrix is good, and there are no over burning and porosity defects.