This work will introduce a novel vibration isolation model in which a constant-force mechanism is designed based on the interaction between the cam mechanism and the crank-slider mechanism for aiming to directly obtain constant-force behavior over a larger displacement region. In order to attain this behavior, the profiles of cam mechanism will be designed in detail. Then, instead of doing experiment, a virtual prototyping technology will be utilized to evaluate the vibration isolation response of the isolation model. Indeed, by using SolidWorks software, a virtual mechanical prototyping technology of the proposed isolation model is built. The dynamic behavior of virtual model is obtained thanks to dynamic analysis in COSMOSM motion module of the SolidWorks product family. The virtual analysis result confirmed the isolation effectiveness of the proposed isolator compared with that of the equivalent linear model. Furthermore, this study offers a useful insight for the design and manufacture of isolators towards low frequencies.