Based on the feasibility experiment and analyses,an intelligent defrosting scheme using the comparison calculation of indoor coil temperature is put forward.Comparing with other schemes,it is proved by experiment that intelligent defrosting scheme has the advantages: the starting time to defrost is more reasonable;the defrosting period is shorter,which means the defrosting efficiency is higher;at the meantime the frost can be eliminated clearly,and defrosting operation can be avoided when frost does not exist.Also the cost is low,and market feedback appears very good.