As one of the general mathematical models of polymers, self-interactive systems have been studied extensively. In this paper, however, we investigate the method on modifying the dynamic properties of self-interactive systems by using external inputs. The main idea is that, based on the basic principle of control systems, we will introduce the external inputs to the system. And we will pay more attention to the possible influence of the purposeful external factors on the dynamic properties. Some interesting results can be obtained mainly based on simulation. So we can find many new properties or dynamic characteristics about the system. The research may also provide people with the possibility of improving the properties of Brownian dynamics of polymer chains.