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Software test is an important step during software development. Improving the automation of software testing can increase the robustness of software and decrease the cost of development. The key of improving the automation ability of testing is improving the automatic test data generation. The paper presents a new method to generate test data for multi-path coverage. The method uses a two-dimensional matrix to record the paths whether the test data passed, and improve the fitness function to suit the new method. In the end, it presents a case study to evaluate the efficient of proposes an efficiency of the method.