In some oilfield associated gas well and natural gas well, the gas composition is complex, mainly including methane and ethane, and also contains heavy carbon components such as C3, C4, C5 to C9, and is accompanied by a small amount of impurities such as sulfide, carbon dioxide and water. Among them, the heavy carbon components below C3 have high recovery value. The mixed hydrocarbon and light hydrocarbon recovery plant designed and produced by our company is specially designed for such conditions. The process of this plant is mainly composed of feed gas pre-treatment, pressure regulation, condensate separation, condensate fractionation, product storage system, dry gas re-compression and refrigeration etc.