Northeast lies on the highest latitude in China.Its warming trends is one of the most remarkable area of climate change under the background of global warming, and has particular climate change. The data of denser station in Northeast China since the establishment are employed to analyse the climate change of the average and extremum temperature during recent 44 years with Yamamoto check method.Climate trend coefficients, etc.the possible effects of this change are discussed preliminarily. The results show that warming trend exists under the area. The warming trends have the season difference and region difference.It behaves stronger in winter and weaker in autumn. The increment of minimum temperature is twice of that of maximum.