Abstract: On basis of fault crossing deformation data of Capital Circle Region, we obtain long trend information and detailed information using wavelet decomposition and reconstruction, and get the frequency of the periodic signal using time-trequency analysis of wavelet detail signals and remove the cyclical factors in the original data. In order to analyze the present-day activity characteristics of the fault in Capital Circle Region, the three-dimensional activity of the fault and comprehensive index of vertical activity are calculated. According to the coordinative ratio index of fault activity, the "abnormal" activity characteristics of the fault are obtained, and the precursory significance is analyzed in combination with earthquake cases, which can be used as a basis for the risk analysis of medium-strong earthquakes in the capital area and its adjacent areas in the future.