Metakaolin is a type of high activity, manmade volcanic ash material, formed by high temperature heating of dehydrated kaolin a certain ratio good quality high alumina clinker, anhydrite and other inorganic materials. It is an expansion agent that has properties of being anticracking and water resistant. During a study on “Yangshao Concrete”, it is found that when metakaolin is added into hydraulic lime(contained in calcinated ginger nut), the strength of the stone body formed by the hydraulic lime could be improved significantly; however, the shortcoming is a big distortion due to shrinkage. This paper describes a study of“Yangshao Concrete”, aimed at using it for consolidation of the cracks in the conglomerate grottoes, by studying in the laboratory different ratios metakaolin and the expansion agent AEA to hydraulic lime of calcinated ginger nut, in order to learn the basic properties of the mixture, e.g., fluidity, setting time, shrinkage and strength on aging. Suitable grouting materials and ratios are selected to treat the cracks of sandstone grottoes.