Abstract: To evaluate the effect of agro-meteorological hazard to the maize yield in sand-meadow ecotone in 2013 after the disaster, the author tested the yield in Horqin Left Back Banner, combined the methods of remote sensing and ecological classification, gave priority to remote sensing image data, which was complemented by the ground testing data to attain the area of crops that damaged, and carried out the disaster assessment in Horqin Left Back Banner. The results showed that in every township of Horqin Left Back Banner agricultural districts, the order of maize yield degree affected by meteorological disasters was: Shuangsheng Town>Jinbaotun Town>Charisu Town, their totally lost area were 669.87 hm2, 55.23 hm2 and 6.77 hm2 respectively. The reduction of maize yield was mainly affected by meteorological disasters, but also by soil type, maize growth period, topography and other factors. Using the characteristic of the maize growth vigor reduction which showed that spectral responses characteristic difference, make it possible to estimate the area of maize suffered from disaster of different degrees, which played a very important role for agricultural remote sensing yield estimation.