Abstract: The rotation-induced micro-Doppler effect is common in radar detection scenarios, and the resulting micro-motion features are related to the geometric and kinematic parameters of the target. This paper comprehensively analyzes the formation mechanism of rotating blades micro-motion echo time-frequency features based on half-wave cancellation from the line integral model of micro-motion echo. Firstly, the formation mechanism of the instantaneous frequency of rotating micro-motion is analyzed under the far-field condition based on half-wave cancellation, which explains the double-end effect of the time-frequency characteristics of rotating micro-motion. Further, the half-wave cancellation analysis is extended to the near-field condition, and the effect of the double-ended region and the specular scattering region of the time-frequency diagram accentuated under near-field conditions is explained. Moreover, for both far-field and near-field conditions, this paper gives a quantitative analytical calculation method for the time-frequency results. This paper analyzes the time-frequency features of near-field and far-field from the perspectives of image shape and energy change, discusses the effects of different conditions and parameters on the shape and details of the time-frequency features, and unifies the near-field and far-field analyses based on the half-wave cancellation analysis, meanwhile, the line integral model and the local scattering model are linked. The simulation experiments verify the correctness of the proposed analytical methods.