To overcome the drawbacks of stricture representativeness of quadrat,great error,resampling,the mode of yield estimation based on field window was proposed.Based on mechanism of remote sensing on crops using administrative village as survey region,the field extracted from QuickBird image and TM image was used as main data.Combining with the methods of field survey,a preliminary discussion about key technology of remote sensing yield estimation based on field window from two aspects of sampling field and region of corn and peanut was made.This study was attempted to extract the crops on large scale,considering that it would have better results of crops using classification supported by field window.It also showed that there was a linear relationship and significant positive correlation between NDVI and yield per unit area.The method using the TM image supported by field window and combining with field survey is considered to be a suitable mode of yield estimation for the southern China with disconnected field and complex plantation type.