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Automated testing of embedded real-time software is a hotpot in nowadays software testing area. In this paper, the relations between unified modeling language (UML) and embedded real-time software testing are introduced firstly. And then, based on the extensions of UML diagrams and the scenario technology, we propose the test cases generation for embedded real-time software based on extended UML. Furthermore, combined with the verification of test cases generation process for avionics embedded system, the research thoughts and methods are brought out. The verification result shows that the method proposed in this paper can be used effectively in automated test cases generation of embedded real-time software testing and improve testing efficiency and maintainability so as to reduce the test cost.