As an important area of resource carrying capacity researches, land carrying capacity is an important reference basis to evaluate sustainable development ability of a special region. Selecting Jiangsu Province as a study case where has fast socio-economic development speed and prominent man-land contradiction, the paper established the evaluation indicator system of comprehensive land carrying capacity from the four supporting systems including water and land resources, economy and technology, society, and eco-environment. Then, comprehensive land carrying capacity is evaluated by applying the weighted multi-factors synt hetic appraisement method at county level. According to the evaluated results, land carrying capacity of Jiangsu Province is divided into three types , i.e., high, moderate, and low carrying capacities. On the whole, it decreased from south east, midwest to north and seaboard of Jiangsu Province.