Abstract：A new adaptive thresholding function used to denoise signals is studied. The construction of the new thresholding function is illustrated in detail, and the advantages and handicaps of the new method comparing with the hard and soft thresholding function is given. The measurement system based on visual instrument LabVIEW and Matlab used to acquire and analysis the vibration signals of gear case is built. The experimental results shows that the denoising method using the new adaptive thresholding function is valid, which can obtain the main characteristic of original signals and has superior features over conventional methods, possess certain practical value.