Abstract: Batches of 50CrVA compression springs fractured during the process of fatigue test. In order to find out the failure mode and cause of the springs, macro and micro observation, EDS analysis, metallurgical examination and hardness testing were carried out. The results show that the compression springs fractured due to cadmium embrittlement. Cadmium embrittlement crack came into being during the process of removing hydrogen and originated from surface pit formed during cadmium plating process. Higher temperature during removing hydrogen and improper rust protection during the process of shot peening and general inspection are the main reasons for the cadmium embrittlement cracking of the springs. The cadmium embrittlement cracking of the springs can be prevented by strengthening rust protection during shot peening and general inspection process and controlling the temperature during removing hydrogen.