Abstract: Residual ore reserves of Longhuo gold deposit in Guangxi is 656177 ton. Average grade of ore is 2.78g/t. The total amount of gold is 1823. 06kg. Economic evaluation indexes of the deposit calculated are as follow: net profit per year is 1.3735 million RMb, revenue per year 1. 0165 million RMB, investment profit reate 15.71%, profit yield 21.21%, static take-back period 4. 7year, dynamic take-back period 6.5year. net present value 2.1170 million RMB (meet the condition NPV≥0), finance inner yield 13.35% which is quite the same with basic inner yield for this industry. In a word, there occur good economic effect and it's feasible to develop the deposit. In addition, the development of the deposit can improve economic of county, employ the workers come off sentry duty, stabilize relationship of nation, improve standard of living and cultural making of local people. It can produced good social effects.