Abstract: To address the challenge of overwinter operation for large artificial wetlands in northern China, in this study the Heituwa constructed wetlands of Guanting Reservoir was examined using a “stable pond + constructed wetland” combination process, to investigate water purification under low-temperature conditions from 2008-2020, incorporating continuous inflow, operating under ice cover, and maintaining wetland macrophytes． Water from the Yongding River was found to meet Class Ⅲ surface water standards after treatment by the Heituwa constructed wetlands． Removal rates for TN, \mathrmNH_4^+ -N, BOD₅, TP and orthophosphate were (30.84±25.74)%, (60.14±23.80)%, (36.84±32.16)%, (39.47±34.65)%, and (48.92±34.63)% respectively． The stabilization pond effectively degraded nitrogen and phosphorus nutrients, while the constructed wetland performed well removing \mathrmNH_4^+ -N, COD_Mn and BOD₅． Different types of constructed wetlands had their own advantages, the purification effect in terms of water quality in constructed wetlands was as follows: subsurface flow wetland zone Ⅰ > subsurface flow wetland zone Ⅳ > surface flow wetland． The combination process of “stable pond + constructed wetland” exhibited significantly high pollutant removal efficiency under low temperature in winter, providing a reference for the construction and operation management of wetlands in northern China．