A mechanism for deploying software over clouds is provided. The mechanism comprises the following steps. A source cloud platform stores a software project and builds up an environmental transfer configuration. The source cloud platform collects the settings of the software project and related resources to obtain a list file, and a target cloud platform receives the list file and assigns a corresponding data transmission status as un-transmitted. When the data transmission status is un-transmitted, the target cloud platform requests the source cloud platform for the software project. The source cloud platform transmits the software project to the target cloud platform. When the target cloud platform confirms that the software project has been received completely according to the list file, the target cloud platform accordingly installs the software project and builds up related resources.