By making use of the data of 1978 - 2003 and establishing Error Correction Model, the paper points out that finance supporting agriculture in China cannot enhance the comprehensive production ability of agriculture, but a temporary policy. The finance supporting agriculture did not strike up efficiency mechanism of increasing income of farmer for long time and production stabilization of agriculture, and it also cannot promote the safety of food supplies. The author analyses the reason why finance supporting agriculture cannot enhance comprehensive production ability of agriculture and puts forward some advice about how to realize the ability of agriculture production increasing by finance supported.