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Airborne embedded software is an important part of avionics systems and its safety is directly related to flight safety. Because software security covers a wide range, the evaluation of security tends to be long-term and the results are not clear. Aiming at the difficulty of embedded software security evaluation, the classification fuzzy comprehensive evaluation method was adopted in the whole life cycle of the software, and the evaluation model was established. An embedded software security evaluation method was proposed, and fifty-nine evaluation elements were proposed in five stages of its life cycle. Each evaluation element reflects the key activities of the software in each stage. The relevant project personnel are selected to evaluate each element, and the software safety value is obtained according to the calculation formula. Proved by engineering practice, the method is practical, the evaluation process saves time compared with the traditional method, and the evaluation result is accurate and intuitive. It provides a new method for the safety evaluation of aviation airborne embedded software, especially model software. Providing support for the overall quality of the software and the improvement direction of software security.