This paper applies grey overall connection degree analysis of testing the relationship between the financial investment in support of agriculture and rural economic growth and makes some conclusions.To promote the disposal efficiency of financial fund in support of agriculture maximally,it is necessary to vastly increase the financial fund in agriculture.In the years of natural disaster,the relief fund should be increased for agriculture.It's also important to increase the investment for agricultural science and technology and rural infrastructure construction,to reduce the expenses on the financial price allowance.