A heat exchanger pipe with continuous helical baffles was proposed.Pressure distribution and head loss of the heat exchanger pipe were calculated.Numerical simulation results on head loss were consistent with physical model experiment.Loss coefficient curves of this baffled pipe were obtained and the spiral angles of the baffle were investigated in detail.The spiral angle of the baffle was the key factor of head loss coefficient and the head loss was almost the same for different pipes with the identical spiral angle.Head loss coefficient was related to the pitch of the helical baffle.There was an optimal spiral angle with the best pitch with the smallest head loss for this heat exchanger pipe.