In allusion to the requirement of single-component gases identification and trace concentration measure, a gas array inspect system is put forward based on absorption spectrum measure and multi-spot measure technology, and a novel array gas-sensitive sensor is developed which takes metallic porphyrin as sensitive material. In addition, the principle of the system and the spectral response pattern for two kinds of gaseous simulacrums are mainly researched, and partial least square combined with BP neural networks recognition model for response pattern and calculative algorithm for trace concentration measure are provided. At last, the experimental results show that the prediction correct rate for 50 unknown samples of gaseous Dimethyl Methyl Phosphonate (DMMP), Dimethyl Benzene (DMB), Sarin, Soman and Phosgene is 98%, and the maximum relative measuring errors of gaseous DMMP and gaseous DMB are 3%.