An intelligent method to develop exam and quiz sheets for an online test system is presented in this paper.The intelligent method applies an adaptive crossover rate and mutation rate's biologic genetic algorithms to the question selection for exam and quiz sheets.The mathematic model consists of genetic iteration,sample adaptability function,mating probability,aberrance probability,optimum selection and error estimation.All details of the coding and operation of the model are shown in the paper,and the results of the experimental applications of the model are also discussed.The running time and error analysis show that the improved genetic algorithm is more satisfying compared with the traditional Simple Genetic Algorithm and Probability Method.In the paper some technique procedures and key skills for developing online test system are introduced,which are based on Personal Home Page(PHP) and database MySQL applications.