In order to improve the ability of anti electromagnetic interference for electro optical imaging system,electromagnetic compatibility(EMC) for the electro optical imaging system is designed.EMC of the system parts that are easy to produce or cause interference was designed by using shielding,grounding,filtering and other techniques,and two tests(power cable conduction emission and electric field radiation emission) were carried out.Experimental results show that conducted emission can be reduced more than 35dBμV,and radiated emission can be reduced about 27dBμV/m,which meet the requirement of electro optic imaging system in a complex electromagnetic environment requirements.