Objective   					To study the toxicity mechanism of mice testicular cells by lead exposure.
					   Methods   
					   Methods   					of SCGE (Single cell gel electrophoresis technique)and MTT were used.
					   Results   					There were different degree DNA damage of testicular cells by lead exposed to group(0.15%), group(0.3%), group(0.6%). The length of DNA migration were significant different to the control groups(P < 0.01). Lead restrained testicular cells proliferation. MDA level were increased and SOD and GSH activity were decreased.
					   Conclusion   					Lead caused oxidative damage and DNA break damage of mice testicular cells, and restrained testicular cells proliferation.