Abstract: The determination of creep parameters of salt formation directly influenced the analysis results of borehole-wall stresses and stability. However, laboratory core testing is often not true of field situation and affects the correctness of the results.This paper takes the assumptions of salt formation submitted to the behavior of viscoelastic model and initial in- situ stress and Poisson's ratio not varying with time. Based on field measured information, a method for the inversion analysis of elastic constants and viscous parameters of salt formation was established.The results indicated that the modern inversion analysis theory of rock-soil engineering has the less cost and more feasible to
the laboratory core testing in the determination of creeping parameters of salt formation.

Key words: salt formation, creep parameters, inversion analysis