Using the green herbage yields,environment and the remote sensing(RS)data observed in different grassland types in the northern slope of Tianshan,Xinjinag Province from 1991 to 1996,the correlation analysis and the estimating yield methods were studied using the 3S technology integration.The methods of processing images,and collecting and using information,and lining RS data and grassland data were explored in the paper.The results showed that there existed an obvious correlation between the fresh herbage y...