Fecha de publicación: 29/09/2023 Fuente: Wipo "BigData" The invention relates to the technical field of big data analysis and mining, in particular to a figure portrait construction system for specific populations with epidemic diseases, and the system comprises a first data extraction module which is used for obtaining first data of known target persons; the personnel screening module is used for screening potential target personnel according to the first data; the second data extraction module is used for extracting second data associated with the potential target personnel; the risk level determination module is used for determining the infection level of the potential target personnel according to the second data; and the portrait construction module is used for setting a potential target person label and an infection level label for the potential target person so as to construct a portrait. The method has the beneficial effects that by introducing the first data of the known target personnel, screening the potential target personnel based on the first data, extracting the second data, and determining the infection level, the target personnel label and the infection level label are set, and the portrait construction is effectively realized based on the target personnel label and the infection level label.