The hydropower trade in China has been in short of equipment coding standards for a long term,which causes there is no effective communication and management technical tool among the different stages of hydropower station construction and relative units.

Study of coding capacity for bar code based on composed piece;

Expatiation of the coding principle and analysis of the coding capacity revealed that the capacity of the new bar code is much larger than that of conventional bar codes.

In this paper,the usual method is illustrated that barcode is used in coding for chinesecharacter On the basis of studing the coding principle of bar code and analyzing the coding capacity of bar code,we select a coding scheme for high-density CCB and give the method thatthe coding table of high-density CCB is listed through programme.