With the improvement of urbanization's level, the destroys of land resources become severer and severer, and the expense is huge. According to their features, land resources can be classified as environmental loss, available ecological loss and land restoration costs. By studying the principle and technique of evaluating these three losses, we put forward quantification pattern of ecological loss of land resources. The research of Wanzhou district, Chongqing city indicates that the number of total ecological loss of land resources during the urbanization from 1995 to 2001 is about 344.70 millions yuan, it is 4.70% of GDP in 2001. In the mass, Wanzhou district is not in a sustainable development because the ecological loss of land resources during the urbanization continually increased.