The present invention relates to a method for predicting electromagnetic interference using design rules in printed circuit board (PCB) design, and converts into a standard input file using output data of various computer-aided design (CAD), which is used for PCB design. The user can set various electrical characteristics that are not included in the data by using environment variables, and the various factors that can cause electromagnetic interference and the data necessary to check them are stored in the design rule database. By inputting environment variables and design rule data, the possibility of electromagnetic interference in the printed circuit board is recorded in the output file, so that the designer of the printed circuit board re-designs the part where the problem may occur and eliminates the cause in advance. Printed circuits can minimize the occurrence of electromagnetic interference The substrate can be designed effectively.
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