进化优化方法常被用于生成结构化测试用例。现有方法每次仅针对一个被测对象，生一个测试用例。要生成覆盖所有目标的测试用例集，需多次执行进化过程。本文基于集合进化优化方法，实现新的测试用例生成方法。实现的算法中，一个个体包含多个测试用例，因此，一次运行该算法能够生成满足测试需求的测试用例集。(Evolutionary optimization algorithms often used to generate structured test cases. When generating test cases, existing methods generally focus on a target and generate a test case to cover the target. In order to cover all targets, the optimization process must be executed many times. A new method for test case generation is implemented based on set evolution. In the implemented algorithm, a chromosome represents many cases, thus generating a set of test cases which satisfy the testing requirements in a running.)