The separator in the transportation and storage system of natural gas is mainly used to remove solid and liquid impurities mixed in natural gas,to improve the purity of natural gas, and to reduce the damage of impurities to the transportation pipeline and storage tank of natural gas storage system. The structure of traditional separator is complex, and the installation and maintenance are very complicated.The separation effect of formation water, condensate and natural gas is not good, and the control system is complex, which affects the production efficiency and increases the production cost.Based on gravity and inertia separation technology,a multiphase flow separator with intelligent control and higher efficiency was designed.The separator has simple structure and easy operation.It has been used in enterprise production link.