Honeycomb seal has a good sealing performance，which can effectively reduce leakage of seal and improve the stability of the rotor.Aimed at the serious leak problem of low power steam turbine,honeycomb seal was used to reconstruct its low and high pressure ends.The effects of reconstruction were verified through simulation analysis and practical application.The results of reconstruction show that the honeycomb seal can reduce the amount of steam leakage and the extent of emulsification of the bearing lubricant effectively,can suppresses the excited vibration of rotor caused by the fluid and reduce the noise of plant operation.