The invention relates to the field of computer application technology, and particularly to a system for quickly constructing a work flow and a realizing method thereof. The system according to the invention comprises a flow definition management module, a flow configuration management module and a flow engine API. The method comprises the steps of adding work flow basic information, flow node information and node variation information into a system database, then configuring node variation information and testing flow variation; publishing a work flow; entering the system by a user, selecting a service name, and configuring the corresponding work flow. The system can realize quick construction of one service work flow by personnel in a government department and flexibly configure each node and variation information in the work flow. Furthermore the system is suitable for realization of each service work flow in the government department.