At present, the thermal recovery method is widely used in heavy oil recovery engineering, in which the high temperature and pressure wet saturated steam is injected into the oil well from the steam injection pipeline, and the heat carried by it is exchanged with low temperature heavy oil, so as to improve the fluidity and permeability of heavy oil and realize recovery. Wet saturated steam dryness is an important parameter affecting thermal recovery effino recognized measurement method existent method. There is no recognized measurement method. At present, the commonly used method is manual measurement, but the measurement results of this method have serious hysteresis. In order to achieve the purpose of real?time monitoring of dryness, a new measuring method, matrix conductance method, under the condition of 10 MPa and 310 °C, a 26×26 wire mesh model was established to measure the dryness of wet saturated steam in a steam injection pipeline with an outer diameter of 76 mm and an inner diameter of 54 mm. The measurement principle of the matrix conductance method is introduced and the dryness algorithm model is established. The electric field simulation was carried out in Ansys Electronics software, the electric field between the layers was analyzed, and the results show that the suitable interlayer spacing is 2 mm. In order to improve the accuracy, the linear interpolation method is used to process the edge, and the actual measurement error is predicted; the overall error after primary linear interpolation is within 2.50%; after quadratic linear interpolation, the overall error is less than 1.10%.