The differences of main properties of the soils between islands and the of coast mainland in Eastern China were studied through eight typical profiles from Zhejiang, Jiangsu and Shandong provinces.The soils are derived from the acid parent rocks.The results showed that pH, BS%, Silt/Clay, SiO₂/Al₂O₃ and SiO₂/R₂O₃ in island soils were higher than those in the coast mainland soils, while Redness Rating(RR) and Clayization Ratio in island soils were lower than those in the coast mainland soils with the same latitude.The soils of islands are characterized by rebasification, which makes it great difference from the soils of mainland.The intensity of pedogenic processes is weaker in island than in mainland with the same latitude.