On the basis of the results of static tests of the full-scale subassemblage of exte-rior joints in reinforced concrete frames,and with reference to other experimental results of homeand abroad.This paper analyses the load-earrying capacity of the anchorage end of 9O-degree bentbeam reinforcement in the exterior joints,verified the horizontal development length of this kind ofanchorage end Specified in the state standard' Concrete Structure Design Code',and proposes im-provements for the design concrete and specification for this kind of anchorage end.