To meet the demand from the growing number of user experiments, multi-beam-line\r\noperation with a wide spectral range is seriously considered in x-ray free-electron laser\r\nfacilities. In a conventional design, the beam line of low photon energies branches off from\r\nthe middle of the accelerator to take out low energy electron beams. Here in this paper, a novel\r\nmethod is proposed to deliver bunch-to-bunch energy changed electron beams at the end of the\r\naccelerator. Since all accelerator components are operated in steady state, this method enables\r\nquasisimultaneous operation of multi-beam-line in the same undulator hall without degrading\r\nthe stability and performance of the electron beam.
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