This research aims at the complement of a process for solving structure-borne sound problems on machinery. This process is based on the characteristics of Statistical Energy Analysis, for example, SEA models enable us to know the vibration and sound propagating paths and to identify the power inputs into subsystems. Four steps are made in the process proposed as followings, 1) construction of SEA model, 2) identification of power input and power transfer paths during operation, 3) extraction of SEA loss factors for countermeasure and 4) structural design for realization of loss factor desired to be changed. Two elemental techniques are developed and required for the accomplishment the process, one is for the identification of power input during the operation and the other the evaluation of the sensitivity of subsystem energy due to loss factors based on the perturbation method. The process is verified to be applied to a laser beam printer for reducing the structure-borne sound. As a result, it is shown that the application brings about 4 dB sound pressure level reduction at a target frequency band in one-third octave band.