Gas-solid two-phase flow parameter detection is widely used in industrial development， and the real-time monitoring of its parameters plays a decisive role in production efficiency and environmental protection. Based on the gas-solid two-phase flow experiment platform，this paper analyzes the sensitivity characteristics of the electrostatic sensor under different wind speeds by finite element; extracts the characteristic value of the collected electrostatic signal，combines the linear fitting analysis with the least square method，and proposes an electrostatic signal The mathematical model of characteristic quantity and dust particle concentration; finally verified by relative error analysis. The experimental results show that the root mean square value of the electrostatic signal is more related to the particle concentration，and the relative error is controlled within a very small range of 0.5% to 1.24%，which confirms the reliability of the mathematical model and is a gas-solid two-phase flow parameter detection technology Provides new ideas.