Based on the high resolution numerical prediction products of China Meteorological Administration (CMA),the refined numerical prediction products of European Centre of Medium-range Weather Forecasts (ECMWF) and the data from national ground observation stations in China,the Northwest Intelligent Grid Temperature Objective Prediction Method (NWTM) has been developed by using wavelet analysis,sliding training,optimal fusion and other technologies,which can be used to deal with the time-frequency of the model error sequence and realize the correction of the model system error and local error.In order to test the forecast ability of the two model data,the data from March 2017 to February 2018 were used as training samples,the data of 239 national basic stations in Northwest China from March 2018 to January 2019 were tested.Results show that:(1) NETM can significantly improve the temperature forecast ability of CMA and ECMWF models.With the increase of forecast time,the errors of correction products of the two models increase.(2) Using the NWTM,the correction effect of ECMWF products on maximum temperature in Northwest China is obviously better than that of CMA,but the correction effect of CMA products on minimum temperature is more significant.Among them,for the 24 h maximum temperature,the correction effect of ECMWF in Ningxia is the best,and that of CMA in Qinghai is the best;for the forecast of 24 h minimum temperature,the correction effect of CMA in the four provinces of Northwest China is similar,and that of ECMWF in Shaanxi is the best.(3) The spatial error tests show that the correction ability of ECMWF correction products for the forecast of maximum temperature is obviously better than that of CMA,especially in the Hexi Corridor and the east-central region of Gansu,the north and south of Shaanxi,the south and central region of Ningxia,and most of Qinghai.In terms of the forecast of minimum temperature,CMA and ECMWF have better ability to correct the forecast of minimum temperature in Hedong region of Gansu and the south of Shaanxi.However,the correction ability of ECMWF correction products in the south-central region of Ningxia and the south of Qinghai is higher than that of CMA,while the correction ability of CMA correction products in the central region of Shaanxi is better.