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The exhaust temperature could be increased to heat DOC and promote DPF regeneration by part of cylinder deactivation in low load condition.In the article,with asymmetric exhaust system and EGR valve,cylinder deactivation can be achieved.The advantages and disadvantages of diesel engine cylinder deactivation are analyzed by experimental and modeling methods.Besides the keys factors are given.For test engine,cylinder deactivation can raise the exhaust temperature by 160 centigrade.Totally the fuel consumption drops by 3#.In theoretical extreme situation,the air flow ratio of half deactivated cylinder and normal condition is located from 1.29 to 1.34,which is influenced by booster efficiency in greatest degree.The fuel consumption and NOx emission increase in some conditions for lower air fuel ratio and not optimized injection parameters,further calibration and booster efficiency promotion are helpful.