Abstract: Capillary impregnation of pure resins in the transverse direction of unidirectional cloth beds was studied elementarily by using self-designed fiber holder. The effect of experiment parameters, such as temperature, fiber volume fraction, fiber types and the stacking orientation of unidirectional cloth on the velocity of the capillary impregnation was investigated. And the impregnation of the unidirectional cloth without sizing on the surface was tested. In comparison with the cloths with sizing, the capillary impregnation velocity of clothes without sizing appears to be much quick. The results show that increasing the temperature and decreasing the fiber volume fraction can both improve the velocity of impregnation. However, changing the stacking orientation of the unidirectional cloth has little influence on the impregnation behavior.