Vibration parameter of blower is researched on how to affect the basement vibration by the vibration power flow theory，and used pump unit in a dwelling plot needing isolation vibration as an example .Blower isolation vibration system can be simplified a single-deck isolation system power flow model, by using E-F analog picture method, while adjusting the parameters such as intermediate mass and area density，the curves of foundation speed amplitude and power flow are drawn by using Mat lab calculating program, the results show that increasing the intermediate mass has clearly reduced the vibration power flow and speed amplitude, but vibration parameter of intermediate mass only has little effect on the vibration amplitude, and the isolation vibration effect can be improved by increasing area density of the basement.