Abstract:Rock magnetic and paleomagnetic studies were carried out on the Early Cretaceous red beds at Simao area of Indochina Block, the characteristic remanent magtization (ChRM) directions obtained from Zhenyuan, Pu’er and Jiangcheng, such as Ds=52.4°,Is=45.5°,κ= 77.9,α95=6.3°, Ds=46.2°,Is=46.6°,κ= 50.9,α95=5.6° and Ds=8.6°,Is=42.2°,κ= 117.1,α95=4.0°. The elongation/inclination (E/I) correction model was applied to evaluate the inclination error from the Pu’er and Jiangcheng sections, results of the correction model indicate that inclination shallowing was negligible within the uncertainty in Jiangcheng, however there's the illusion of inclination shallowing in Pu’er, as the declinations are scattered, resulting in the illusion of elongation and the corrected inclination is too large. The differences of declination between all the sample sections at Simao area suggest that differential rotation has taken place within the block, the deformation process is not only controlled by boundary faults, is also closely related with activities of the internal small faults. Taken the Cretaceous shallow inclination in the South China block into consideration, the Simao area has been subjected to south displacement by 570±310km with respect to the South China block since Cretaceous, presumably close to the estimation of structural geology evidences. Key words: Indochina Block; Cretaceous; block movement; intracontinental deformation