In order to efficiently specify multi-enabling property which is an important character of concurrent systems using partial order logic, a new logic, flow event structure logic (FESL), was proposed. Flow event structures served as models for supporting the specification for casual properties between runs of concurrent systems, and two extra configuration qutifiers “A” and “E” which specifies the properties of configurations were introduced to establish the axiomation system for FESL. Completeness and soundness of axiomation system for FESL were proved. The proof showed the logic the power of specifying multi-enabling property.
