Abstract: Cultivated land is the valuable natural resources and the base of agriculture production, it is very important to food safety, economic development and society stability. This paper takes Kenli County of Shandong Province as an example, analyzes the trend in the change of cultivated land, and carries out forecast for cultivated land demand quantity and supply quantity. The results indicate that cultivated land quantity decreased and cultivated land quality declined as a whole from 1996 to 2005. The forecast results confirm that the supplying quantity of cultivated land can not suffice food safety. So, Protecting the existing cultivated land is to protect our lifeline. This paper put forwards the strategies for protecting cultivated land in the end.