Abstract: The granite gneiss of the Late Proterozoic Jinning stage is the main exposed rock in Haiyangsuo area，eastern Shandong Province，China. These are some lenses and structural blocks of ultramafic rocks(serpentinite)，metamorphic gabbro，plagioclase amphibolite and metamorphic silicalite with varying dimensions and proportions in the granite gneiss. The strong deformation and metamorphism took place in these structural blocks，but the Yaodao accumulative gabbros，that formed through the mineral accumulation under the low pressure and isobaric cooling condition，have the distinct gabbro texture and rhythmic structure，and consist of troctolite，olivine gabbro and amphibole gabbro. Multistage metamorphic reaction textures were preserved in the troctolite and olivine gabbro. There are two different mineral assemblages for the corona texture in the accumulative gabbros. The one is between plagioclase and olivine. It contains the mineral assemblage of orthopyroxene, spinel，amphibole and garnet; The another is between plagioclase and ilmenite. It is only in the olivine gabbro. The mineral assemblage is more simple and contains garnet，amphibole and rutile or garnet and rutile. The former may be divided into three generations on the basis of petrographic evidence. The early mineral assemblage is characterized by orthopyroxene，dinopyroxene and spinel that formed through a reaction between olivine and plagioclase at temperature of about 760℃—876℃ and pressure of 0.44—0.60GPa; the intermediate mineral assemblage is marked by appearance of tschermakite and disappearance of clinopyroxene via the reaction between plagioclase and clinopyroxene subsequently at temperature of about 660℃— 700℃ and pressure of O.40—0.5O GPa: the late mineral assemblage is characterized by formation of garnet and pargasite or pargsitic hornblende resulted from the reaction between tschermakite and plagioclase at temperature of 650℃—660℃ and pressure of 0.83—0.92 GPa The latter is only one generation and marked by the formation of garnet by the reaction between ilmenite and plagioclase at temperature of about 620℃—630℃ and pressure of 0.71—0.86GPa. The temperature and pressure of metamorphism process indicate that the early metamorphism is isobaric cooling and the late metamorphism is isothermal boosting for gabbroic cumulates after magmatism of isobaric cooling This special P-T evolution may reflect the characteristics of cool emplacement and deep subduction of accumulative gabbros.