In order to put forward protective measures and reduce the hazards caused by gas explosion events, it is significantly important to analyze the antiblast properties of the slab. According to the precast slab and poured slab that badly damaged in this two accidents, the antiblast ability of the slabs and explosion overpressure were analyzed. The overpressure differs little but the destruction differs much of the two accidents, so effects of some parameters on the the antiblast ability of the slab were calculated based on multigroup models. The results show that, boundary condition is the primary influence factor, the next is thickness, while the influence of reinforcement ratio is comparatively lower. Based on the calculation results, some protective measures were put forward. The analysis methods and conclusions can offer certain reference to the housing protection design and study.