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With the excavation depth increase, the bursting stabilization had become a major factor affecting the security of foundation pit. On the base of research situation about foundation pit stabilization and a large number engineering practices, the factors and the complexity that affected the stability of foundation pit were analyzed. The new ideas about mechanism and determining methods of bursting in foundation pit were proposed, that with the “hydraulic fracturing” to explain the mechanism of bursting and the factors that affect the stability of foundation pit as a system to analyze the anti-bursting stability and the factors that affect bursting stability could be divided into two types, system strength and system stiffness.