Abstract: With the expansion of two-dimension barcode application field,optimization and improvement of two-dimension barcode are imperative.A fixed length coding algorithm has been used in Chinese character encoding,there is a large redundancy because the algorithm ignores the frequency of Chinese character which has an impact on the efficiency of two-dimension barcode encoding.A variable length coding algorithm can reduce the length of some commonly used Chinese characters.Tt the same time,it can reduce the average length of two-dimension barcode in Chinese characters,correspondingly,it can increase the maximum number of Chinese character encoded in the two-dimension barcode.First of all,according to the frequency of commonly used Chinese characters,all of the commonly used Chinese characters were divided into different segments and encoded independently,and a table for variable length coding algorithm was created.Then,all of the Chinese characters based on the variable length coding algorithm were encoded without brea-king the standard two-dimension barcode encoding rules.At last,the time performance and spatial performance of fixed length and variable length coding algorithm were analyzed.Experiments show that the variable length coding algorithm can cut 18.4% redundancy in Chinese character encoding.

Key words: Lower redundancy,Two-dimension barcode encoding,Encoding in Chinese character