With the rapid development  economy and urban construction and enlarged scale of industrial and civil construction, the cement to the technical disposal of building surfaces is much higher than before . on the basis of improving body's engineering design and instructing quality.Improving the surface quality, like roof of building and wall and floor, becomes a crucial task to the construction field. So on the basis of successfully developing polypropylene fiber-mesh for concrete and polyester fiber for bitumen for bitumen and in view of some technical problems existing in constructing field, our company sums up experiences and develops cracking-resistance reinforced fiber for cement paint (using in plastering). This fiber can improve quality of building's wall and floor, and supply a new technical measure to reduce the surface crack, so it has a good economic value.