The calculation of charging time is generally divided into two parts in accordance with critical pressure，and the releasing time calculation is not distinct. Combining with an aircraft pressure loading test，the charging time of cabin was calculated with general formula and the releasing time was calculated with integral method. The charging and releasing time were analyzed with simulation software，and the results were compared with the theoretical results. The results show that it is more reasonable to use the integral method to calculate the releasing time，and the simulation software can fully simulate the conditions of charging and releasing，which can provide reference for similar tests.