In order to improve the precision of static analysis for C procedures, this paper introduces a static analysis method applying region-based symbolic three-valued logic (RSTVL). RSTVL can describe shape of data structures, all kinds of memory states and relations of addressable expressions including alias relations, hierarchical relations and logic relations. To improve precision, a RSTVLbased analysis method is proposed to analyze the shape, dataflow and point-to relationship at every procedure point. The method facilitates flow-sensitive and field-sensitive intra-procedure, and context-sensitive inter-procedure analysis based on symbolic function summary. Experimental results validate that the porposed static analysis method offers higher precision on the precondition with no efficiency loss.