Abstract: Started from the business logic of common update and evolution demand,this paper studied the evolution behavior of service combination under the condition that service set in service combination can't change. I3y proposing the evolution behavior set SEI3S in service combination, this paper defined basic evolution operation of service work flow architecture adjustment and proved that SEI3S can maintain the rationality of service combination after evolution. Thus,the rationality of inner flow logistic can' t change during the operation of service combination evolution. A case study shows that it can be put into practice.

Key words: Business logic, Service combination, Evolution demand, Sound evolution behavior set, Evolution operation,Work flow net