In the process of development of modern science and technology, education technology has also been developed according to its own characteristics. In the development course of the modern education technology, computer-based education plays an important role. In this paper, the influence of computer-based education on education is researched according to the change of its influential factors on schools, teachers and students aimed at the characteristics of computer-based education. In this paper, the principal component analysis method is employed to extract the main influential indexes, the layered index evaluation system is established, and it is concluded that computer-based education has a profound influence on education. The design of online education system is also researched, on the basis of summarizing the overall design function and process, the design thought is explained and the design and realization methods of database are given, so as to provide theoretical reference of the development and scale application of online education system.