The SiC coating was deposited on the SiC fiber through CVD routine, and the effect of deposition time on the fiber performances was investigated at initializations such as 2h, 4h, 6h and 8h. The results indicate that the fiber without coating showed better mechanical properties than those with coatings. The coating, of which the thickness increased with the lengthening of deposition time, altered from island appearance to continuous layer appearance at the same time. Furthermore, the single fiber strength displayed a raise-and-down tendency.