According to the geological occurrences of low-grade metamorphic rocks and high to ultrahigh pressure metamorphic rocks(UHP) in the Sulu orogenic belt, There are the low-grade metamorphic rocks which underwent greenschist facies metamorphism in the middle Dabie ultrahigh pressure(UHP) metamorphic belt and at the north edge of the UHP metamorphic belt. By studying thg area distributing,geology character and geochemistry of the low-grade metamorphic rocks, it indicates that the original rocks of the low-grade metamorphic rocks and part of the high pressure-UHP rocks not only tie tightly up on their causes of formetion and together experienced teconic events during the subduction-colliding of the Yangze plate, but also make sure that the low-grade metamorphic rocks are the structure tags which due to subduction of Yangze plate. In terms of the accretionary wedge model of plate subduction, the geodynamic processes of formation and evolution are explored for the different grades of metamorphic rocks in the Sulu orogenic belt. The results provide constraints on the tectonic locations of subduction and suture zones between the Yangtze and Sino-Korean plates.