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The performance of a SASE-FEL strongly depends on the beam parameters, such as a longitudinal beam profile, a bunch charge, transverse emittances and an energy profile. The correlation between the longitudinal electron positions in a bunch and their energies has a critical effect on the temporal evolution of the optical pulse of SASE, and various methods to evaluate the longitudinal phase-space profile are under intense study. A new technique to measure the longitudinal phase-space distribution of the bunched electrons in one-shot using the combination of an energy profile monitor and a streak camera are currently under development at ISIR, Osaka University. In this contribution, preliminary experimental results of the measurements are presented.
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