Abstract: Multi-parameter stacking developed rapidly in recent years is a data-driven seismic imaging method independent of velocity model. One of the most typical techniques is Common Reflection Surface(CRS) Stacking. Using the primary kinematic response of a diffractor, we have deducted a new Multi-parameter stacking formulation in a 2D inhomogeneous medium. Combined with a parameter searching optimization strategy which is similar to CRS in data domain, we could obtain zero offset time section which represents complex geological conformation. Model tests have shown that the new operator is efficient and reliable.