The purpose of the study is to equip product designers with a holistic system view by applying a system engineering approach, Object-Process Methodology (OPM) pairing with a design thinking process, to the early stage of the product development. The study demonstrates the implementation value and conceptual system modeling feature of OPM through the product design case study, which presents its potential application of Model-Based System Engineering (MBSE) language and framework for the complex challenges by applying system thinking and design approach.