This paper describes software developed for personal computer in order to manage the international controlled materials, Th and U, based on the law and regulations. The software was programmed by using commercially available data base software. The materials are managed so that the amount of each meterial is less than the legal limit. The history concerning receipt, transfer, use, storage, and disposal of the material in each container was recorded, and printed out as a book or a legal report. Tests with dummy data confirmed that the software displayed expected performance.