1. A simulating method of manufacturing flow which is applied in a semiconductor foundry, the simulating method comprising: building a plurality of operational blocks in accordance with operational data of each manufacturing equipment; integrating the operational blocks and building at least one operational library; building a plurality of strategic blocks in accordance with throughput data of each manufacturing equipment; integrating the strategic blocks and building at least one strategic library; collecting data from the operational library and strategic library and building a operational model; and performing manufacturing flow simulation in accordance with the operational model.