In this study, our integrated design process and framework for space launch vehicles (SLV) was developed. The established design process consisted of the ‘Requirement Analysis’, ‘Mission Design’, and ‘Conceptual Design’ stages. In the ‘Mission Design’ stage, the mission and sizing results are obtained. The ‘Conceptual Design’ stage contains several analysis module: the Propulsion, Aerodynamics, Load & Structure, and Weight. These stages implement the system engineering process, and each stage exchanges information interactively. And the framework for SLV design is developed based on the VB.Net. The whole data of input and output are saved in SQLite which is database program. The results of design are obtained using KSLV-II specification and the validation is performed.