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In order to solve the problem of low detection efficiency and short detection distance of traditional gas patrol equipment, the network combines the tunable diode laser absorption spectroscopy technology and the backscatter of the objects,a set of vehicle-mounted laser methane remote system is designed, and has carried on the simulation test. The test shows that the system is minimum detection limit for methane is 5 umol/mol.m, and it can detect concentration of 0.1% methane leak at a distance of 150 meters, and can detect the gas leak point at a speed of 50km/h. Its distance is long, response speed is fast, the sensitivity is high, anti-interference ability is strong, which well meets the actual detection needs. Through the gas company actual application shows that the system greatly improve the efficiency of the gas inspection, reduce gas inspection cycle, very suitable for the long distance pipeline rapid inspection, and the practicability is well.