Abstract: Based on the correlation analysis and fuzzy mathematics, the evaluation of sustainable land use in Tai'an city was studied with 30 indexes which concerned nature, environment and social economy. The weighted value of each index was calculated with the method of correlation coefficient. According to membership function curve, the subjection degree was calculated. Integrated quality index (IQI) can be achieved and tested through gross agricultural production. Finally, land use sustainability of Tai'an city was evaluated with IQI. Result shows that the sustainability of land use in Tai'an city takes on an up-trend during 1990～2001, which illustrates that the land quantity changes toward good condition.