In the case of the problem that the height parameter of target cannot be measured by 2D radar, a height estimation method by 2D radar network is proposed. Firstly, the height of target is estimated preliminarily through the redundant parameter information of the same target measured by two 2D-radars. Secondly, the weight of preliminary height estimation between different groups of radar is calculated by definition of closeness degree and consistency measure and mean of consistency and consistency variance and coefficient of variation. Finally, the height of target is estimated on the basis of the fusion weight and the preliminary height estimation. Typical example is used to validate the proposed estimation method. The result shows that the height of target can be estimated well, and the method has theoretical and practical significance.