In order to obtain a better human-machine engineering implementation effect and get a faster feedback during the bridge designing, the paper suggested a virtual simulation and evaluation method. And by using of the software Visual C++, MultiGen and Vega, an evaluation simulation system was also built. Such a system can display the whole layout of the bridge, evaluate the key human-machine designing elements and do real-time simulation. It can also provide decision supporting to the designers. Through actual usage proof, the method is quite availability and has practical value.