The NCEP and MODIS data of 8 days in 4 months (January,April,July and October) of different seasons are used in this paper to estimate the atmospheric precipitable water over China.First,the precipitable water is derived from integrating the relative humidity over the whole layer atmosphere from the NCEP data.Second,we employ the model put forward by Bao-Cai Gao and Kaufman to derive the precipitable water from the MODIS data.The results show that the MODIS atmospheric precipitable water data is generally greater than the NCEP data in the northwest and inner mongolia area of China.But in the southeast and part of south area of China the MODIS atmospheric precipitable water data is small than the NCEP data.If we multiply MODIS atmospheric precipitable water data with 0.933983 and 1.07686 over previous two areas respectively,the difference between two data is less than 0.2cm.It is accurate enough to most satellite derived model.So we can conclude that after revised the MODIS atmospheric precipitable water data can be used to satellite derived model and can improve the retrieval accuracy of some satellite remoting model.