Abstract: Based on Copula function，this paper analyzes the reliability of software architecture with dependent components.After offering the models about reliabilities，the average life and the failure rate of the system，this paper discusses the relationship in average life with positive orthant dependence situations，i.e. in dependent and independent systems.Moreover，case studies have been done to analyze the effects of the number of the components as well as the dependence degree among the components on the average life of the software architecture.