To study the coupling relationship between the sedimentary characteristics of the sand pile and the morphology of the thicket of Caragana tibetica at each stage of evolution， to analyze the changes of the sand pile of the thicket of Caragana tibetica over time， to elucidate the correlation between the thicket and the sand pile as well as the characteristics of the sand pile surface sediment at each stage of evolution， and to reveal the changes of the sand pile and its sand-blocking ability of the thicket in the course of the development of the thicket of Caragana tibetica. The sandpile changes during the development of the Tibetan mallow scrub and its ability to block the sand. Based on the field survey， three typical thickets of the sandpile of Tibetan mallow scrub at different stages of evolution （developmental stage， stabilization stage and activation stage） were selected from the sample site， and the morphometric parameters of the thickets and the sandpile were measured to study the correlation between the sandpile and the Tibetan mallow scrub， and then the sediment characteristics were analyzed through the sampling of different parts of the sediments. The results showed that the morphology of the sandpile of the Tibetan Jindjir scrub was mostly oval， and the long axis （L_d）， short axis （W_d）， height （H_d）， horizontal scale （HC）， bottom area （S_d） and volume （V_d） of the sandpile of the Tibetan Jindjir scrub at each stage of the evolution showed the stage of activation>stabilization>development. The overall grain size content of the sand pile sediments in the development stage was intermediate； the fine sand and powder grain content at the top of the scrub slope in the stabilization stage was higher， showing a gradual increase； the particle content in the activation stage was high， and the peak value from the bottom of the windward slope - the top of the slope - the bottom of the leeward slope was showing a trend of increasing and then decreasing， which indirectly reflected the interception effect of the scrub sandpile on the sand particles. The correlation between scrub morphology and each parameter of the sand pile sediment was greatest in the stabilization stage， indicating that between scrub and sediment due to the oval shape of the scrub， the surface sediment indicated that with the evolutionary stage， its scrub had the strongest sand fixation capacity in the stabilization stage. The morphology of Tibetan brook trout is not strongly correlated with each parameter of sand pile sediments during the developmental stage due to the small size of the scrub. The correlation between the scrub and the sediments became more and more unstable as the evolutionary process progressed.