Taking non-ideal explosive composed of hexogen (RDX), oxidant ammonium perchlorate (AP) and combustible agent aluminium(Al) powder as the research object, the gas products and condensed phase products of eight non-ideal explosives exploded and produced in a confined explosion container were collected and analyzed by thermal analysis-mass spectrometry technology, Fourier infrared spectrometer, gas chromatograph analysis and X-ray fluorescence analyzer. The heat of detonation was calculated by Hess′s law and compared with the experimental value. Results show that under the condition of the detonation, the detonation products mainly are composed of gases N₂, H₂, CO₂, H₂O, CH₄, CO and O₂ etc and solid compositions Al, Al₂O₃, AlCl₃ and C etc. With the increase of the positive oxygen balance, the generation quantities of N₂, H₂O, CO₂, O₂ and HCl increase, while those of Al₂O₃, AlCl₃, H₂ and CO increase firstly, and then decrease, The generation quantities of Al and C decrease. The measured heat of detonation of non-ideal explosive with oxygen-balance in the range of -22.4%~-29.7%, is between 8773 and 8813 J·g^-1, and the relative error between theoretical and expermetal values is less than 1%, showing a good agreement.