Evapotranspiration is an important component of the water budget of wetland. By using the remote sensing technology, the evapotranspiration of wetland can be computed effectively and appropriately. The remote sensing classification technology is combined with the quantitative remote sensing technology. In view of different land with different evapotranspiration sources and different water and heat transfer mechanisms, an integrated model is established and is used to analyze and compute the evapotranspiration of some major wetland. By comparing the average evapotranspiration of different wetland with the measured data, it is shown that the integrated quantitative remote sensing model of wetland evapotranspiration combined with classification can get a good result.