The sperm viability, mobility parameters such as prorsad percentage motility, straight line velocity ( VSL), curve line velocity ( VCL), velocity of average path ( VAP) and morph were estimated with a computer-assisted sperm analyzer ( CASA) provided with a multiple-exposure photography system. 采用计算机辅助的精子分析系统分别检测精子活率、运动参数(前向运动百分率、直线速度VSL、曲线速度VCL、平均路径速度VAP)和精子形态。