Abstract: According to the negative factors that "low permeability, low reservoir pressure and low gas saturation " of China's coal reservoir, the system of authigenic nitrogen acid catalytic fracturing fluid is developed to increase the reservoir permeability, enhance the reservoir energy and raise the temperature. The experiment analyzes the impact of autogenous nitrogen and catalyst ratio in the fracturing fluid on the reaction rates, gas production, and determines that the best autogenous nitrogen molar ratio is 2.5∶1, which is applicable to fracturing coal reservoir, the best quality concentration of autogenous nitrogen dosage is 8%~12% and the pH of reaction fluid is 4~5. This paper explores the impact of different temperatures on the reaction rate and gas production and analyzes the catalytic effect of different types of acid.