In order to calculate electromagnetic characteristic of target's DXF models, the model's data format is analyzed, the reading and analysis methods are studied. A sort of simpler quality factor, which is defined as the length ratio between the shortest and the longest edges, is proposed. The real DXF model's quality is analyzed according to the factor and the gained result is as good as in References 1 and 2, the correctness and validity of the factor are proved. Through analyzing, the better meshes generating quality of DXF model is proved.