A Software Life Cycle (SLC) is used to describe the phases of software cycle and ensure the good quality software is built. A Software Reliability Hierarchical Structure Modeling (SRHSM) is proposed for the analysis and allocation of the software reliability before it is used. A software system can be regard as hierarchical and composed of a set of interacting system elements which implement to fulfill its respective specified requirements. Based on the previous work, the concepts of SRSHM method is optimized and increased some basic elements. The SRHSM method comprises two processes in SLC, including Partition and Composition process and divides the system into four levels: System level, Subsystem level, Unit level, Code level. A software partition process is to allocate the software reliability to each module and composition process is applied for the analysis of software reliability.