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The effect of hydrostatic pressure on the corrosion behavior of nickel in NaCl solution was investigated by electrochemical measurements and OM/SEM observation. The increasing hydrostatic pressure deteriorated the pitting corrosion resistance of nickel, distinguished by the decrease of critical pitting potential (E-cirt) with increasing passive current density. The results also demonstrated that hydrostatic pressure had three effects on the corrosion behavior of nickel: (1) the increasing hydrostatic pressure hindered the passive film formation; (2) the increasing hydrostatic pressure retarded the B1 process (parallel birth and death stochastic model) and accelerated the A3 process (parallel birth stochastic model); (3) the pitting growth probability increased