Abstract: Human body capacitance of miners decreases quickly to one tenth while body moving voltage increases up to a dozen times at the narrow exit in the coal mine, which is easy to be a source to detonate the gas. The study of the electrostatic bleeding rules of human body shows that the electrostatic half-life is relative with the material resistivity. From a series of simulation experiments of the gas exploded by human body electrostatic discharge, the relationship between different human body capacitance, discharge gap, gas concentration and gas explosion is obtained.