[Objective] In the Loess Plateau, six typical small watersheds were selected to monitor the shape features, development stage and morphological change of erosion gullies in these watersheds, and analyze stability of erosion gullies. We aim to build a preliminary assessment index system for erosion gully stability.[Methods] In these small watersheds, every time before and after the rain, sub-meter measurements were carried out in typical cross-section of main gully channel and branch channel, and gully head.[Results] The number of each class of erosion gullies in the six typical watersheds and the data of cross-section and gully head of branch channels were obtained. The assessment index system of erosion gully stability was preliminarily built.[Conclusion] The factors influencing the change of channel morphology are summarized as follows:precipitation, water conservation measures, vegetation cover, catchment area, slope, matter of earth's surface and so on.