The effects of land use changes caused by grain for greenery on the soil quality were studied through calculating soil quality index(SQI) and restoration index(RI).The results indicate that SQI and RI are 14.16%~64.82%and 0~190.63%respectively.Both SQI and RI suggest that vegetation reconstruction and abandoned land can improve soil quality and extensive agricultural farming can decrease soil quality. Both SQI and RI have a linear positive correlation(R~2=0.86) and they can be used for soil quality assessme...