Abstract: With the development of urbanization in China, the high quality construction land has been significantly decreased. Rational utilization of defective land resources is a great subject of urban development faced at present. In urban expansion process, we often meet sandstone pit or weak soil area, and the foundation treatment method and result will affect construction cost and superstructure quality security. The foundation is a sandstone pit with a wide range of depth of 17 m. A new foundation treatment technology for sandstone pit with sizable area was introduced. Practice proves that it is an economic and effective method of ground treatment and has fulfilled the design requirements of the stability of soil bearing capacity.