The state of the art process modeling and optimization software was reviewed. Motivated by increasing demand on modeling and optimization of systems with large-scale and high complexity characteristics

a new application mode with service-oriented open architecture was proposed.ASCEND (advanced system for computations in engineering design) was chosen as the base for equation-oriented modeling. Its inherent structure

data flow

working mode and communication interface were redefined and reconstructed. With support from COM/DCOM/AUTOMATION technology

AscendServer was built as the core service providing modeling and optimization functionalities. Some key issues such as componentization

event handling and coordination between processes were discussed in details. Within this superstructure

modeling and optimization for large-scale complex systems could be integrated with more extensive data exchange

more flexible application mode and more adaptative capabilities. A data reconciliation system of water consumption balancing for a petrochemical company was given to verify the efficiency and functionalities of the new open structure service for modeling and optimization.