Li, B.T. Lu, X.Y. Xiao, L. Yang, D.Y. Yang, Y. Yang, Z.Q. Zhao, J. JACoW Geneva, Switzerland 978-3-95450-191-5 10.18429/JACoW-SRF2017-MOPB080 English 254-258 MOPB080 ion electron experiment cavity cathode Contribution to a conference proceedings 2018 2018-01 https://doi.org/10.18429/JACoW-SRF2017-MOPB080 http://jacow.org/srf2017/papers/mopb080.pdf The concept of micro-pulse electron gun(MPG) was proposed decades ago. It can provide electron beam with high current, short pulse and low emittance. But it is still not put into practical use as electron source because of its unsteady operating state. This paper presents an experimental result of the steady running of MPG which can operate stably for more than ten hours. The energy spread of the electron beam is also measured, the peak is located at near 20eV and half width is less than 15eV .