Aiming at the problem of weak signal detection, this paper introduces the principle of stochastic resonance and systematically analyses the relationship between the bistable system threshold and system structure parameters. It is concluded that the structure parameters play a decisive role in the stochastic resonance phenomenon. Also this paper analyses the effect of potential barrier in nonlinear systems. The greater the potential barrier, the higher the energy demand of both signal and noise to have synergistic effects. Based on the conclusions above, we can bring the system to stochastic resonance through adaptive to adjust structure parameters, and that is able to adapt to greater frequency range change, which can also improve the detection effect of the stochastic resonance method.