Abstract: Developing software operational profiles is an important work of software reliability testing. Aiming at the poor applicability and the difficulty of the traditional operation profile construction method to the software of airborne fire control radar software,by analyzing the characteristics of the traditional construction method of operation profile, a method of constructing the use model of hierarchical Markov chain is proposed. Referring to the decomposition method of "system mode section-function section-operation section" of Musa, the operational mode of airborne radar is decomposed hierachically and encapsulated. The Markov mode is used to transform the operational mode, determine the execution probability of execution sequence, and establish operation profile. Finally, an example is given to verify the effectiveness of the method.