The invention provides a method capable of extending a user application type in cloud computing environment. A system provides a management interface, each management implementation class is published as open service gateway initiative (OSGI) service, a user calls interface base classes through a management main interface to put forward operational application, and the system seeks applied management implementation classes according to application type name parameters required to be transmitted by the management main interface and calls responses of the applied management implementation classes. The method achieves extensibility at two stages, namely the development stage and the operation stage. In the development stage, when a new application type needs to be increased, no interface is changed, no original application types is influenced, and development of the newly-increased application type is achieved rapidly. In the operation stage, application types can be increased or reduced in dynamic on-line mode under the condition that user use cannot be influenced.