青藏高原降水氢氧稳定同位素及其相关的代用资料对深入认识青藏高原气候和水文变化规律具有重要意义。引入水稳定氢氧同位素模块的大气环流模式有助于理解降水同位素及相关古气候代用资料的气候意义。近年来，有研究将松弛逼近方法应用于这些模式中，通过融合再分析资料的环流信息减小模式误差。然而，该方法对降水同位素模拟能力的改善程度还需进一步研究。本研究利用青藏高原同位素监测网络（TNIP）数据，评估了 4种带有水同位素模块的大气模式以及它们融合不同再分析资料后的青藏高原降水氧同位素模拟结果。结果表明，四种模式均能较好地再现降水 δ18O的气候平均态和季节变化，模式对青藏高原地区年际变化的模拟能力较低。模式融合再分析资料的青藏高原降水 δ18O空间分布和季节循环变化模拟效果明显优于自由运行模式。模式间的差异比再分析资料之间的差异对降水 δ18O模拟结果的影响更大。综合来看，再分析资料的融合能有效地订正模式对青藏高原周边大气环流的模拟误差，从而改善模式对降水和降水 δ18O的模拟能力。本研究为改进青藏高原降水及其稳定同位素模拟提供了有益参考。

The stable isotopes of hydrogen and oxygen in precipitation over the Qinghai-Xizang Plateau and their related proxy data such as ice cores and tree rings are of great significance for a deeper understanding of the cli‐ mate and hydrological changes on the Qinghai-Xizang Plateau. The introduction of stable water hydrogen and oxygen isotope modules in atmospheric circulation models helps understand the climatic interpretations of precipitation isotopes and related paleoclimate proxy data. In recent years，some studies have applied nudging techniques to these models to reduce model errors by fusing reanalysis data. However，further research is needed to deter‐ mine the extent to which this method improves the simulated precipitation isotopes. This study used data from the Qinghai-Xizang（Tibetan）Plateau Network Isotope Plan（TNIP）to evaluate four atmospheric models with water isotope modules and compare the results with and without nudging reanalysis data. The results indicate that all four models can well reproduce the climate mean annual precipitation δ18O and seasonal variability of precipitation δ18O，while the models have lower simulation ability for interannual variability of precipitation δ18O. The simulations of the spatial distribution and seasonal cycle changes of precipitation δ18O over the Qinghai-Xizang Plateau with nudging reanalysis data is significantly better than that of free running simulations. The differences in model choice have a greater impact on the simulation results than the differences in nudged reanalysis data. Overall，the fusion of reanalysis data can effectively correct the model bias in the atmospheric circulation over and around the Qinghai-Xizang Plateau，thereby improving the model's ability to simulate precipitation and precipitation δ18O. This study provides a useful reference for simulating stable isotopes of precipitation over the Qinghai-Xizang Plateau using models and the improvement effect of nudging techniques on the hydrological and climatic simulation of the Qinghai-Xizang Plateau.