Strengthening layer made of continuous carbon fiber fabric-magnesium oxychloride cement (MOC) paste was tested by direct shear. Improvement of bonding performance of MOC paste was explored by extending curing time, increasing water content, adding silica fume and adding organic binder(epoxy re-sin).The mechanism of the improvement was analyzed. The results indicate that the bonding performance of MOC paste can be improved by extending curing time, adding silica fume and adding organic binder instead of adding water. Silica fume is a kind of superfine powder, when its use level is 10%(by mass), it can be well dispersed in MOC paste and filled in the gaps between carbon fibers. Thus, the carbon fiber can be wrapped better by MOC paste to increase the bonding performance of the paste. And the organic binder can also be well dispersed to play the full role to improve the bonding performance of MOC paste. Because of the lower infiltrating property of MOC paste to the continuous carbon fiber fabric, MOC paste as the binder is not as good as organic binder.