The latest C-NCAP covers 40% offset 64 km/h test as well as 50 km/h full frontal test which proposes further requirements for the airbag systems. In this study, a passenger airbag of an electric vehicle, based on a B-class platform, was developed in the CAE circumstance, for the purpose of the C-NCAP 5-star rating. Two types of concept passenger airbags were drawn based on the vehicle interior model, and evaluated through in-vehicle simulations. Static deployment test was conducted for in-vehicle analysis and module correlation, followed with passenger side restraint system optimizations with MADYMO simulations for the optimal set-up of the real world C-NCAP crash test. The effects of crash pulse, TTF, and dummy position were considered in simulations for the final parameter definitions. With this virtual design-validation process, the preliminary passenger airbag parameters for the crash test can be achieved more efficiently.