As I am a mechanical Engineer and in my master degree my research topic was Experimental investigation of thermal fatigue life of engine cylinder liner of engine cylinder liner and when i search the different professor's profile at Yanshan university.I find professor Zhao Jun whose research area matches with my interest that was in forging and stamping lab. So i requested to professor Zhao jun and he accepted me and give me a acceptance letter. So this was the reason of choosing Yanshan university.