Abstract: A regional brand of agricultural products is a distinctive complex identity of a region and its products established naturally in the region couldn't be replaced by other regions. The core nature of regional brands of agricultural products is the region and its products can't be separated. Based on the analysis of the mechanism that regional brands of agricultural products can promote on development of regional economy, this paper made regression analysis with data of the number of geographical indications of agricultural products and the total value of outputs produced by agriculture, forestry,animal husbandry and fishery industries of every provinces of our country. Empirical results show that there is causal relationship between the number of geographical indications of agricultural products and the total value of outputs produced by agriculture, forestry, animal husbandry and fishery industries of every provinces of our country; And there are important effects that regional brands can promote on the development of regional economy. Therefore, we should attach more importance to build regional brands of agricultural products, and we can promote on economy of agriculture by building regional brands of agricultural products.