The energy structure is characterized by “more coal,less oil and gas” in China,the Synthetic Natural Gas(SNG）and power polygeneration system with coal gasification technology as the core has wide application prospects in China. However,the coal based polygeneration system based on traditional gasification technology has limitations in further improving energy efficiency. Based on the coal-steam gasification technology,this article integrates an efficient series-parallel SNG and power polygeneration system with a thermochemical recuperation unit. The system model was built in Aspen Plus software. Based on indicators such as thermal efficiency,energy saving ratio and exergy efficiency,the energy utilization characteristics of the system were analyzed. The results show that compared with the SNG and power polygeneration system based on traditional gasification,the thermal efficiency and exergy efficiency of the novel system have been improved by 5.5% and 5.8%,respectively. At the same time,for each set split ratio,there is a best chemical island unreacted syngas recycle ratio to optimize the thermodynamic performance of the system. When the split ratio is 0.5,0.7,0.9,1.0,the corresponding optimal recycle ratio is 4.8,4.4,4.3,4.0 respectively. Also,the series polygeneration system can use energy more reasonably than the series-parallel polygeneration system,and the thermal efficiency,energy saving ratio and exergy efficiency of the series polygeneration system at the optimal recycle ratio can reach 68.06%,20.24%,69.43% respectively. Exergy analysis shows that the two largest parts of the system exergy destruction are mainly distributed in the gasification unit and combined cycle unit,the exergy destruction of the two parts are 17.0% and 6.3% respectively,accounting for 49.4% and 18.3% of the total exergy destruction,respectively. Therefore,polygeneration system based on thermochemical regenerative steam gasification technology has high energy utilization efficiency and carbon emission reduction effect,and can provide an effective energy-saving way for high-efficiency and low-carbon utilization of coal.