An optimal design for seismic energy dissipation structure damper was conducted based on EP gain and by means of taking displacement between floors as interesting output. After directly obtained EP gain, the maximum displacement between floors wasn't improved obviously, in spite of having an increase of useable structure spatial. If the elements of weight matrix corresponding to the weak storey were multiplied by a penalty factor, the optimal effect would be improved obviously. The given procedure was applied to a 10-storey RC frame to verify ...