Some building was once belonged to a dangrous building due to the grievous uneven foundation settlement and the wall structure cracking. The numerical analysis and calculation of the stress state of structure nodes of the building was made. Based on the results of analysis and calculation,it was decided to reinforce the partial foundation of the building by steel pile and grout-in-jection while moderately patching the super structure of the building,so as to reinstate its mechanical properties of structure and normal functions of use. The reinforcement of the building has been successful,and good result has been obtained. This paper presents the distinctive reinforcing method and technology of the building.