The present invention discloses a deploying and adjusting method for service functions among data centers and a deploying and adjusting device for the service functions among the data centers. The method includes the steps as follows: determining the deployment priority of each service function according to the data size processed by each service function in a first deployment scheme; determining the feasible deployment position of each service function according to the forwarding path corresponding to a service function chain where each service function is positioned; establishing a search tree according to the determined deployment priority of each service function and the feasible deployment position of each service function; searching a second deployment scheme on the search tree, wherein, the second deployment scheme satisfies preparatory conditions and is low in total cost; deploying each service function according to the second deployment scheme. According to the invention, the deployment of the service functions can be dynamically adjusted and the routing overhead is minimized.