Abstract: Due to the change of measure environment, measure equipment and subjective of measure person, the measure signal of foundation steel braces contains noise inevitably and has some outliers. The measured signal is a time series made up of different frequency, and was processed by wavelet analysis. Denoising analysis and outliers detecting of the measured signal is performed using wavelet analysis, and proved by a specific project. The result indicated that this method is effictive for denoising analysis and outliers detecting