Take Shanghai as an example,a study is made about the relationship between the cultivated farmland and economic development with the help of gray co-relation analysis method in China＇s super cities from 1978 to 2008.The results are as follows：there exists an apparent corelation between the total area of a city＇s cultivated farmland and the ratio of the secondary industry in the local GDP. The corelationship between the total area of the cultivated farmland and the ratio of the tertiary industry in the local GDP is comparatively less apparent...
