The present invention relates to a non-intrusive method and apparatus for automatically dispatching security rules in a cloud environment. The method comprises: forming a composition application model of an application in the cloud environment, said composition application model including at least types of various servers for deploying said application; generating a topology model of said various servers in the cloud environment; automatically generating security rules to be adopted by the server-side firewalls of respective servers based on the application context of said application, said composition application model and said topology model; and dispatching said security rules to each server-side firewall based on said composition application model and topology model.