Abstract: An experimental study is conducted on three externally prestressed concrete (EPC) continuous beams for moment redistributions. It is observed, before loading to the cracking of concrete, the exterior and interior support reactions, the flexural moments at midspan and interior support sections are all close to the calculated ones, which are based on the elastic theory. With the cracking of concrete, the exterior and interior support reactions, the flexural moments at midspan and interior support sections gradually deviate from the calculated ones. The measured exterior support reactions and the flexural moments at midspan sections are larger than the calculated ones; while the interior support reaction and the flexural moment at interior support are less than the calculated values. After the yielding of non-prestressed tension steel, such deviations are further enlarged, and reaching their maximum values at the failure of the beams. The experimental values of moment redistribution for the 3 beams are 12.8%, 16.9% and 14.6% respectively. The test results of moment redistribution are also evaluated with the methods of existing design codes. It is shown that American Code ACI 318-95 and Chinese Code GB50010-2010 provide a rather conservative degree of moment redistributions, while British Standard BS8110 gives non-conservative ones. Except for specimen B5, Canadian Code A23.3-M84 predicts the closest degree of moment redistributions to the test results. In the practical design of EPC continuous beams, the Chinese Code method can be adopted if the ultimate stresses in external tendons are reasonably estimated.