A mathematic model corresponding to standard information providing and preliminary budget making is characterized by studying standard information providing of project key technical and economic parameters, project quantity and lists of equipment and materials, regulating standard and depth of project information providing and realizing standard transfer and seamless connection of design and technical and economic work; on the basis of standard information providing, studying logic corresponding relation between information providing content and quota, preliminary rules, technical and economic parameters, project quantity and equipment and materials; establishing a history project typical resource database, generating multidimensional, multi-type and multi-aspect cost index data, and assisting review and re-check work of project cost; and by developing a digital platform and combining reform and upgrading of preliminary budget making software, realizing effective communication with service departments of design and the like and design and technical and economic electronization seamless connection, and improving project cost making efficiency and project cost management level.