PBX-2 explosive accelerated aging 180 days and 540 days at 55 ℃ were tested in Steven test by using a steel projectile of 2.0 kg. The pressure change was measured by pressure gauges, and ignition delay time was analyzed with high-speed motion pictures and pressure curves. The reaction overpressure was gained by blast pressure gauges. The test results of aged PBX-2 explosive were compared with pristine PBX-2. The results show that there is not obvious change for the reaction degree and pressure course of pristine and accelerated aged PBX-2 explosive in Steven test.