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In the development process of complex systems and products, high-quality requirements or requirement models are the essential foundation for accurate description of design requirements and design indicators, multi-level transmission, and model-based review and management. How to improve the quality of requirements is one of the key issues of concern in the industrial field, especially in high-end manufacturing industries represented by aerospace. To enhance the quality of requirements, a meta-modeling method is applied to construct a requirement meta-model, clarifying the composition, relationships, and content of the requirement meta-model. A requirement definition method based on the meta-model is proposed, which realizes the standardized definition of the requirement model through the instantiation application of the requirement meta-model, to meet the characteristic requirements of requirement completeness and unambiguity, effectively reducing the difficulty for complex system or product design teams in defining requirement models. The requirement definition method based on the meta-model provides a feasible practical approach for improving the quality of requirements or requirement models. It also offers ideas for enhancing the extensibility of complex system models and improving the reusability of models.