The geomorphological characteristics of our country are diverse and complex. The combustible gas is mainly transported by pipeline in the transportation process, and gas leakage is inevitable.When leakage occurs in complex mountainous environment, it will not only lead to poisoning degree, environmental pollution and other problems, but also the concentration distribution of leakage gas and the difficulty of identifying the gas leakage boundary.For this reason, a combustible gas leakage boundary recognition system in mountainous environment is designed. The system takes Raspberry Pi as the main control unit, uses MQ5 liquefied gas sensor, GPS Beidou dual-mode positioning ATK1218-BD module and other hardware, based on Gaussian plume model, combined with Gaussian plume model. Radial Basis Function (RBF) interpolation method improves the calculation accuracy of leakage gas concentration distribution in complex mountain scenes, and realizes the visualization of leakage gas boundary through Matplotlib.