While to consider the function of compression coil spring in a static state, the most important is the needs of dynamic characteristics. We infer a design mode with link up the static state and development, and bring both to the constraint condition of optimal design. It is basis of the development function of compression coil spring is the property of vibrate displacement. And we adopt the optimal design of MathCAD in the computer, simplified the handle of several scaling functions. The effect proves that in the living example of compression coil spring from tool-in-use system, it makes that simple and valid. Thus provide a basis for the function design of machine structure.