Abstract: The importance, advantages and application prospects of the composites used for strengthening and repairing constructions are described. Based on analyzing the related references and the authors' recent research work, the key technologies in this field are summarized, in which the reinforcement and resin matrix techniques are introduced in detail. The properties of several types of fiber sheet materials are presented, and the requirements in both processing and properties of those resin matrixes are proposed. Finally, the adhesive mechanism of the interface between composite and concrete is analyzed. In consideration of domestic situation, some researches which are necessary to carry out in this field are suggested.