Abstract: We analyze the characteristics and influencing factors of electromagnetic compatibility of a VLBI station.We then demonstrate the applicabilities of various commonly used evaluation methods,as well as their shortcomings and limitations.Based on such recognitions of the usages of common methods,we propose an improved method that can be applied to evaluate a VLBI system in the Urumqi observatory.The new method adopts the principle of module-building and evaluation-weights solving as in the ANP (Analytic Network Process) method,and also incorporates the advantages of TOPSIS.It further determines weight coefficients by the interval adjustment to reduce subjective influences.To use the new method we construct a suitable network architecture model for electromagnetic compatibility evaluation of VLBI system,which should be important in relevant theoretical and engineering applications.