Currently, the static correction method widely used in the production is almost always based on surface-consistent hypothesis. However, in complex areas with sharp fluctuant topography and great low velocity layer thickness and transverse velocity change, the surface-consistent hypothesis is sometimes unfit for actual geological conditions; in this case, there must be significant errors if surface consistency static correction is still used. Modeling methods are used in this paper to discuss the cause for surface-consistent hypothesis static errors in complex areas and the relationship of this cause to datum, source-receiver offset, low velocity layer, bedrock speed, low-speed thickness and reflective surfaces depth, with an analysis of the variation regularity, in order to improve the existing static correction method, present a new approach and provide the reference for solving the problem of static correction in complex areas.