Active protection technology as an innovative and advanced technology which can increase the battlefield survival for military helicopter.However,our military helicopter especially transport and support helicopter are lack the active protection solution,and liable to be attacked withe great damage cost.In view of the above problems,firstly,active protection system and technology for military helicopter are proposed.Then,the active protection technologies and equipment of the military helicopters at home and abroad are analyzed.At last,the key technical problems for realizing the active protection system are analyzed in detail according to the operational application process.The research results can provide references for helicopter active protection system research and design in future.