Objective To study the effect of Bushengyijing Fang medicated serum on human sperm quality in vitro. Methods Human sperm was co-cultured with Bushengyijing Fang medicated serum in vitro. Human sperm quality was evaluated by computer assisted semen analysis (CASA) and the sperm move high test. Results The co-cultured Bushengyijing Fang medicated serum significantly increased the sperm motion velocity (VAP, VCL, VSL) (P