Heave deformation and fracture are the common instability form of foundation pit, which is difficult to be monitored. Analysis on anti-heave stability is mainly for the calculation of safety coefficients. The main computing methods of safety coefficient of anti-heave stability include limit equilibrium, limit analysis and strength reduction. An engineering example is adopted in this paper, the above-mentioned methods are used to calculate safety coefficients for anti-heave stability, and the applicability of these 3 methods is comparatively analyzed. The results show that more engineering factors are ignored by traditional limit equilibrium algorithm with too conservative result, which can be modified to improve the applicability. The calculation results are more accurate by limit analysis and strength reduction methods, but further study is needed on failure mode of limit analysis and permitted upheaval value of foundation pit stability in critical state by strength reduction.