We present the magnetic and paleomagnetic results of the 219 orieontated drill-core (29 sites) Cretaceous Lumuwan and Baowan Formations Clastic Rocks from Hainan Island. Hematite is regarded as the prime remance carrier; most of the samples can isolate the characteristic directions. The Early Cretaceous yielded a direction of D=6.5°, I=42.7°, κ=73.4， α95=8.2°;the Late Cretaceous yielded a direction of D=6.7°, I=44.7°, κ=125.5, α95=5.4°. The paleo-latitude of the Early Cretaceous is 24.8°(+6.2°/-5.8°), and the Late Cretaceous is 26.3°(+4.6°/-4.0°) . They all locate 5-6° north of the present geographic position. Compared with the Cretaceous paleomagnetic data from the southeastern Huanan Block, Hainan Island is a part of the Huanan Block in Late Cretaceous. Besides the differences of the Early Cretaceous data indicate that Hainan Island exists a northeast structural strike-slip zone. Baisha Fault maybe the southern extension of the South China coast northeast structural belt. Cretaceous paleomagnetic data from Hainan Island also indicates that Hainan Island rotates clockwise by about 25° relative to the Indochina Block in Early Cretaceous. This demonstration is supported by the existence of the first seafloor spreading of the Indian Ocean and the north movement of the Indian Plate in the Late Jurassic -early Late Cretaceous.