In order to solve the problem of multi-objective multi-criteria electromagnetic structure coupling optimization design of valve displacement sensor,for the long stroke,high precision valve displacement sensor whose radial size is strictly constrained,the optimization algorithm program was written in MATLAB to get the optimal parameter matching group with linearity and sensitivity as the objectives and structural dimensions as the constraints.Based on the results of the multi-objective optimization,the equivalent modeling of the valve LVDT was carried out in the electromagnetic simulation software Maxwell,and the electromagnetic field simulation analysis was carried out on the optimized model and the original model to compare their output characteristics.The results show that for the optimized model,the linearity is 0.19%,and the sensitivity is 23.12 mV/mm.Compared with the original model,the optimized model has a great improvement.This method solves the optimization design of the LVDT structure in a more complete manner,and it can provide references for the optimization and design of the miniaturized valve displacement sensor.