In view of vector class and without resolution rate of EPS format, it is difficult to use digital image processing technology for recognition. There are many influence factors to bar code recognition, such as ink spread during the printing process，bar codes are read as sequences of widths of bars and spaces, it makes wrong to compare such widths with each other. The EPS format bar code based on binary method which can judge the bar code accuracy; reduce the printing error; analyzed different amplifying coefficients of bar code; avoid generate film and printing error and waste is proposed. The result proves good.