T his article reduces the noise of GNSS monitoring datas by using global threshold and layered threshold ,which is based on wavelet function .The article calculates the correlation coefficient and smoothness after denoising .By comparing with them ,it con‐clude that the wavelet function has a great advantage for data denoising ,and stratification threshold has a better effect on denoising . T he result provides a good reference value for subsequent processing GNSS .%本文基于小波函数对GNSS监测数据进行降噪处理，采用全局阈值和分层阈值，并计算降噪后平滑度和相关系数，比较两种阈值的降噪效果，得出小波分析对数据降噪有很大优势，而且分层降噪的效果更好，为GNSS后续处理提供了较好的参考价值。
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