H2S is a kind of poisonous gas that exist in oil, chemical production process. The detection of H2S plays an important role in mine, oil and gas exploration, production of chemical product, control of atmosphere environment. The monitoring system for The H2S gas volume fraction has been designed in the application of virtual instrument technique and special H2S sensor of gas sensitive thin film invented by the author inducing and magnifying the circuit. The wide range and high precision of the H2S gas fraction has been inspected and measured and also been alarmed with the utilization of normal temperature H2S gas film sensor. As result of that high efficiency and good quality computer-based numeralization measurement for H2S gas has been come true.