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The comparison methods for two sorted lists on total-order set have been discussed. Several cases are put forward to and the maximum value, the minimum value and the calculation formula for expected value of comparison times between two sorted lists are given and its correctness is proved. The relations between the comparison times and the size of the problem have been discovered by the experiment results and some advices are proposed for the design of lottery and some other activities of this type. The method has been applied in computer simulation for one kind of sports lottery and the consistency is shown by the experiment results between the values of computer simulation and the values of theory method.

In order to meet the needs of special educations, a test platform for visually impaired person has been developed. The statistical results of the applications of the platform show that: The platform can make it into reality for visually impaired students having tests by computer, a new way is provided for evaluating the effects of learning for visually impaired persons; it can greatly promote teachers' efficiency by cutting off the time of making papers, distributing papers, evaluating papers and making score reports; it can reduce the costs for teach-learning operations.

Based on practice and investigsation on system development and application, the difference between usual system and system for people with eyesight disabilities is discussed. S om e rules for analysis and design on system for visually impaired people are given out, and some, ideas thoughts, methods are brought forward too. Experiment have shown the efficiency of these sidea and rules. These thoughts can also be used for usu alsystem for better accessibility.