Abstract: The Qinghai-Tibet Plateau, a region with numerous lakes, is affected by the thermal differences between land and water, so lakes exert a significant modulating effect on the local climate. However, due to the lack of long-term observational data, current research on the thermal conditions of plateau lakes is mostly confined to short-term case analyses. Based on the WRF-Lake model, this study evaluated the applicability of two land surface parameterization schemes, Noah and Noah-MP, over Qinghai Lake and its surrounding areas. Two sets of sensitivity experiments (lake-covered vs. lake-free) were conducted to quantify the lake-induced climatic impacts of Qinghai Lake over the past three decades. The results show that: (1) The WRF-Lake model can well simulate the climate conditions of Qinghai Lake and its surrounding areas. (2) The simulation results of both land surface parameterization schemes underestimate 2 m air temperature, while the Noah scheme yields simulations that better match observational records. (3) Over the past 30 years, Qinghai Lake has exhibited a warm lake effect in spring and autumn on both intramonthly and diurnal timescales. The warming rate and climatic mean values increase with the distance from the lake, and vice versa. In summer, however, Qinghai Lake primarily exhibits a cold lake effect, with only transient warm lake effects occurring at midnight.