Abstract:The methodology and technique of spatial data processing were studied in the emergency assessment of Wenchuan Earthquake impacts on environment. The techniques of multi-source-data integration and fusion were used successfully to integrate data in different format which were collected from different sensors with different spatial, spectral and temporal resolution. The effective coverage of remote sensing image was expanded and the interpretation accuracy of information on disaster was improved. The primary assessment of earthquake disaster impacts on environment was finished quickly and comprehensively. The methodologies and techniques of using remote sensing technology were set up to monitor and evaluate heavy disaster impacts on environment. In order to strengthening the ability to cope with the future disaster, we suggest to emphasize the construction of environmental background database; strengthen and perfect the multi-sector data sharing mechanism and promote using the technique of multi-source-data integration and fusion in China.