In the central sea basin of the South China Sea,there are vast prominently regular striped anomalies which occupy an area of nearly 500000 km².On the basis of analytical correlation and interpretation of these anomalies,it is held that they are manifestations of magnetic striped strata produced by seafloor spreading of the central spreading ocean ridge type,and serve as an example of the oceanic crust accretion.It occurred in Middle Late Tertiary(32.3 Ma～1.7 Ma),and exhibits characteristics of seafloor spreading on the western margin of western Pacific Ocean.The above achievement obtained has deepened the understanding of the formation and evolution of the South China Sea,a controversial problem among geologists both in China and abroad,and hence is of great significance in the study of deep seated geological structure of the South China Sea and crustal structure as well as the development of mineral resources.