[Objective] To analyze the geomorphological classification indicators at the micro scale, in order to provide data support for soil erosion, prevention and control of geological disasters and agricultural planning decisions in Gansu Province.[Methods] Based on the digital elevation model (DEM) data, the optimal analysis window of the geomorphological feature classification and the geomorphological characteristics of Gansu Province were obtained by the window increment analysis, mean-variation analysis, overlay analysis and water box dimension test. [Results] ① According to the mean-variation analysis, the optimal analysis window for DEM classification experiment in Gansu Province was 29×29. ② Based on the classification index system, the geomorphological of Gansu Province could be divided into 13 categories, according to the surface fluctuations, surface cutting degree and topographic position index (TPI) index factor. [Conclusion] Five small watersheds in the study area were selected to test the classification results of the geomorphological features of Gansu Province, and the classification results were in accordance with the actual situation. This paper constructs a classification index system of geomorphological characteristics in Gansu Province, and realizes the classification test of geomorphological characteristics in Gansu Province.