The invention discloses a service process expansion method based on core processes. The method mainly includes the following steps that firstly, the core processes for representing the process variant universality in a new environment are defined, then current service processes are expanded based on the core processes, and expanded service processes adapting to the new environment are obtained; in the service process expanding process, a mapping relation between the service processes and core process nodes is firstly established, and change marks can be used as a basis of node mapping; the service process expanding is based on the core processes, and inverse operation of blocking and hiding operation is conducted on the service processes. The expanded service processes obtained through the method have the characteristics of original service processes and the process variant universality, and compared with the original service processes, the method can be better adapted to the new economical environment.