Abstract: Requirements change propagation is a key factor to the implementation of complex trustworthy soft ware product evolution.From the perspective of the interaction between trust worthy requirements and functional requirements,a four-stage analysis framework model of requirements change propagation is presented based on fourtiers which are the establishment of Requirements Relation Model,the construction of Requirements Dependency Design Structure Matrix,the measurement of requirement change propagation influence and analysis of requirement change propagation influence.The definition of Functional Requirements Influence Relation Matrix,Trust worthy Requirements Influence Relation Matrix and Requirements Variable Transfer Matrix is given.The concrete realization of requirement change propagation is described and analyzed.A dopting embedded monitoring software of aeronautical engine as the example,the paper explains the application of models and method.

Key words: trustworthy software, requirements change, change propagation, trustworthy requirements, design structure matrix