The invention discloses a knowledge atlas network constructing method and system based on massive scientific and search data and a medium. The method comprises the steps of analyzing a project base, and extracting basic information of projects and the document information and direction of each project; extracting a subject term from header information of a set document of each project to serve asa key project technology of the corresponding project; clustering the project direction belonging to the same field; aiming at the projects in the same clustering result, analyzing key technology indexes from common task books and demand analysis instructions of all the projects, correlating the project key technologies and the key technology indexes according to the relevancy of the project key technology and the key technology indexes of all the projects in the same clustering result to form several key technology indexes corresponding to each key technology; finally generating an association table among the field, the project directions, the projects, the key technologies and the key technology indexes, namely the knowledge atlas of the project base. By means of the knowledge atlas network constructing method and system based on the massive scientific and search data and the medium, the development tendency of the future technology can be analyzed and extracted.