The epoxy powder coating was used as the bottom coating,and the polyester powder coating was used as the surface coating to study the performance of the double layer fusion powder after spraying on the natural gas pipeline.The bottom coating uses self-made fused epoxy powder as the main film-forming material,and the surface coating is mainly made of polyester.The influence factors of the polyester powder formula composition,gelation time and curing time of the polyester powder and the influence of the double coating construction process on the performance were discussed.A composite coating for natural gas pipelines with both corrosion resistance and high weather resistance was prepared,which solved the weather resistance problem of urban natural gas pipelines only coated with fused epoxy powder for a long time.