Abstract: A new program structure is given in this paper. In the new structure, a large scale computing program is broken down into a number of independent modules. Information is transmitted among different modules by data-base, so that all the modules can be developed, compiled, and especially suitable for small computers where a number of tasks can be done subsequently on small proportion or independently in several microcomputers at the same time. It is easy to develop, understand, and use program to solve practical problems with this kind of program structure.