New coming foreign students in the United States seemed to be uneasy to say hello. In order to improve, saying hello behavior, a Chinese graduate student conducted a N=1 intensive ABABF design to make self-change. Is was found that after 2 sessions of intervention, a cognitive set technique, the rate of saying hello first behavior was significantly raised from .41 to .69. It was concluded that saying hello first behavior is easily-to-be-performed and is resultful.