Abstract: Agricultural modernization is the key to realize poverty alleviation in rural areas and the foundation of national economic security, and a country mainly promotes the agricultural production through the agricultural policy. Based on the 1991-2014 data about agricultural production in Guangxi, the relation between agriculture public finance and agricultural development in Guangxi was expounded, and the efficiency pattern of financial support for agriculture in Guangxi was analyzed from the angle of marginal theory. The results showed that, nowadays the agricultural production have reached a stable phase, but the scale of financial support for agriculture was still at a low level, the agricultural investment efficiency was limited,and the production characteristic of the financial support for agriculture deviated from the fact of agricultural needs in Guangxi. Therefore, proposals of the financial support for agriculture were offered as followingproperly improving the scale of financial support for agriculture from two levels, coordinating the financial and other agricultural policy, dealing with reasonable investment between public capital and private capital, establishing the tracking and update mechanism of financial support for agriculture and so on, finally to complete the structural reform of agricultural supply side and realize the agricultural modernization on the basis of improving the efficiency of financial support for agriculture.

Key words: financial support for agriculture, efficiency model, agricultural modernization, marginal theory, Guangxi