[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.