Abstract: For investigating the delayed detonation phenomenon of the solid propellant initiated by low magnitude shock waves, the double card gap tests for the solid propellant mainly consisting of Al, HMX and AP were conducted. In the tests, the delayed detonation of the solid propellant was recorded with an X-ray camera. The numerical simulations of the double card gap tests were performed. An Ignition and Growth reaction rate equation was used to calculate the detonation initiation of the solid propellant subjected to multi-shock loading.The pressure histories in the solid propellant loaded by multi-shock waves were given. Both the experimental and calculated results show that delayed detonation phenomenon of the solid propellant initiated by low magnitude shock waves can happen. The repetitive loading conditions by shock waves and the sensitization levels of the solid propellant under shock wave loadings are the main factors for controlling the delayed detonation of the solid propellant.