The time constraints of software evolution process is of significance for whether or not the evolution process can be accomplished in time and for how the execution route of the evolution process is determined. However, current process modelling often ignores the constraint of time factor on evolution process, so that to study and analyse the time factor in the process model is impossible. Aiming at this deficiency, and considering simultaneously the time correlation of timed Petri net and the transient of transition, first of all, the improvement on process level of EPMM is carried out, time weight is added to the conditions in process model, and a time delay-based evolution process meta-model TEPMM is put forward, which can describe the time factor of the evolution process. And based on the TEPMM, an algorithm calculating the shortest completion time of evolution process and a time planning function containing feedbacks route of process model are both given, through the planning function the time correlation in an evolution process can be analysed and studied.%软件演化过程的时间约束对于演化过程能否按时完成以及如何决策软件演化过程执行路线具有极其重要的意义,而目前的过程建模往往忽略时间因素对于演化过程的约束,致使无法在过程模型中对时间因素进行分析与研究.针对这一不足,同时考虑时延Petri网的时间相关性以及变迁的瞬时性,首先对EPMM(Evolution Process Meta-Model)的过程层进行改进,为过程模型中的条件添加时间权值,提出了一种能够对演化过程中的时间因素进行描述的基于时延的演化过程元模型TEPMM(Timed Evolution Process Meta-Model),并基于TEPMM给出计算演化过程的最短完成时间的算法和含有反馈路线的过程模型的时间规划函数,通过该规划函数可以对演化过程模型中的时间相关性进行分析与研究.
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