Virtual prototyping can reduce a great amount of money in designing a product since we can easily predict the appearance of the final outcome. One limitation of traditional virtual prototyping technologies is that they can't provide the expected haptic experience. Inspired by this problem, we develope a haptic virtual prototyping system for a refrigerator door. A user can perceive the opening sensation of the designed door via our custom 1 DoF haptic device, while the 3D visual scene of the door is rendered by a visual display.