Explosion relief hatch is a kind of safety protection facility to protect dry-typed electrostatic precipitator from explosions. A test apparatus was designed to study the performances of the relief hatch, including static pressure performance, set pressure, re-seating pressure, and explosion relief performance. The result shows that the elastic modulus selection of the three-level spring for the explosion relief hatch designed and made by authors is reasonable. The relation between its pressure and stroke change accords with the advanced foreign products that is possessed of similar functions. The set pressure of the relief valve is around 5kPa, and the re-seating pressure is around 4.6kPa, they all meet the design requirement; and the deviations of set pressure and opening/closing pressure meet the requirement as well. The explosion relief hatch as the cover of gas explosion chamber was fixed, and the methane explosion was triggered in the chamber. The process of the gas explosion relief was analyzed using a high speed video, and explosion pressure was acquired by a pressure transmitter. The experiment results show that the explosion relief hatch has the good performance and is able to automatically reset. The dynamic pressure-stroke curve fits with the static test curve perfectly.