[Objective] Exploration and utilizaton Study on the law of wind erosion and accumulated sand in different parts of mobile dune can provide the support for sand fixation technical measures on the desert combat.[Methods] Three instruments of photoelectron snow retention depth-sounder were set up in the typical crescent dune to determinate the wind erosion and accumulated sand process in different positions of mobile dune.[Results] The accumulated sand depth ranged form 1 cm to 12 cm gradually on sand falling slopes with the change of sand-driving wind velocity under the certain wind velocity scope. And the strong sand deposition process was observed when sand-driving wind velocity declined. Windward slope erosion was in the largest state at the sand-driving wind velocity. And the transition process from strong to weak wind erosion formed with the change of sand-driving wind velocity. The top of the dune was erosion process at the near sand-driving wind velocity. And accumulated sand process was found at the top of the dune with the gradual increase of sand-driving wind velocity. In addition, the monthly mean of net wind erosion depth on windward slope of mobile dune was 29.85 cm from December to next May. The monthly mean net increase of accumulated sand depth on the sand falling slope of mobile dune was 139.5 cm from December to next June. But the erosion occurrence at the top of the dune was found from March to November, and the change value of the average erosion depth was 27.3 cm. The accumulated sand occurrence was found at the top of dune from November to next March, and the change value of the average accumulated sand depth was 29.47 cm.[Conclusion] Wind velocity has the important influence on wind erosion and deposition characteristic change in different positions of mobile dune, and wind erosion and accumulating sand were obvious difference in different parts of mobile dune.