LNG series tractor has excellent economical efficiency; under the same horsepower, LNG power can save fuel cost by 30%-40% when compared with diesel power, and the vehicle purchasing cost price difference can be recovered after 8-10 months of operation. LNG series tractor uses T-cab and the following six major reliability design points can ensure the reliability of the whole tractor: body strength analysis, front door deformation and sinking checking, heavy truck frame stress distribution cloud chart, brake clutch stand assembly strength analysis, exhaust butterfly valve stand strength analysis and two-way system multibody dynamics analysis.