The invention provides a third party application centralized safety management method and a system and a communication system comprising more than one authorization server, more than one asset server, a user agent, a third party application and a centralized safety management system, wherein the third party application centralized safety management system is responsible for confirming safety of the third party application, conducting digital signature to the third party application, sending authentication credentials capable of enabling the centralized safety management system to confirm the third party application. The method includes: the third party application sends identity, authentication credentials and access permission to the centralized safety management system in a distinguishable method; after successful confirmation, the centralized safety management system sends the identity, the authentication credentials and the access permission to the authorization server; if the access permission is valid, the authorization server sends access token for accessing to a protected resource to the third party application through the centralized safety management system.