Abstract:The construction technological process of concrete reinforced grouting(CRG) piles and the first construction are introduced. The difficulties and problems in the control of rock stability,clay clearing and rock sediment in drill hole,fixing reinforced pile and grouting in construction are discussed in karst area. CRG piles are design according to socket rock piles,and the in-situ static loading tests are performed. The courses that the lateral resistance of piles is fully utilized,but the bottom rock resistance is not employed. The construction technological process of CRG piles is summarized in karst area. Experiences are accumulated for testing and application of CRG piles to bearing layers in granite and clay sandstone.