The Ailao Shan is a mountain range extending from SE Tibet to the South China sea along the Red River fault. Conforming to the gently dipping of the SE Tibet, the topography sequentially developed from the "youth", and the maturity" to the "old age" stages, which is a rare instance of Davisian Landform Evolution Model presented in the continuous space. Based on ASTER-GDEM, we extracted and analyzed 88 watersheds and a 10-km wide swath profile of the Ailao Shan mountain range along the Red River fault. The landform processes were examined using the topographic features such as the hypsometric integral, elevation, relief, area, slope angle, drainage density and the distribution of knickpoints. From the Juli-Yuanjiang, Yuanjiang-Maocaoping to Maocaoping-Anpei sections, the landform processes gradually changed from youth ,and the maturity to the old age stages,demonstrating the detailed evolution features of the Davisian model. The study further objectively obtained two linear distributions of the knickpoints, which indicating the two-phase river incision caused by tectonic uplift or rapid climate change. The distribution of the upper-layer knickpoints, which below the planation surface further revealed the emergence, continuation and disappearance of the plateau planation surface. In addition, the result also showed the features of stream-net development, varied with high, low and high drainage density in response to stages of "youth, maturity" and old age. This study is helpful for the better understand the landform evolution of this region as well as the Davisian landform evolution model.