The Model based Definition (MBD) technology digital process verification approach is examined. A process verification system for Design for Manufacture (DFM) is introduced. The system uses PMI, or product and manufacturing information, as a vehicle to express product processing information and dimensional information. In the concept design phase, the auto-matic process testing of the product geometry model is realized, and the viability of the product process is examined, thanks to the development of the model testing tool. The test's outcome is evaluated in accordance with the guidelines for producing liquid rocket engines. The designer can adjust and enhance the sketch of the geometry for the liquid rocket engine in light of the outcome. By using DFM, the process accessibility of the product in the design phase is improved, the design and process changes in the product manufacturing process are reduced, and the product development cycle is shortened.