Abstract: Based on foreign codes, details of bundled bars have been revised in China concrete design specification. Anchorage length and details of bundled bars in concrete structure design code of Chinese, American and European were analyzed by some examples. The results show that calculated value of tensile reinforcement anchorage length according to American code is greater than Chinese and European codes, with the increase of the equivalent diameter of bundled bars, the differences between the results increased. Compared with the US specification, the Chinese standard and European standard of anchorage length curve trend and the calculated value is close.