Cloud Computing is an awesome technology which have go ahead and annex the computing world. The development of cloud computing embed its sprouting continually in the recent era. Cloud Computing have contrived clan very lavish comfortable to perform their chore. As its fundamental defnition says that As You Pay As You Go. In this delving work talk about the cloud simulator working in our algorithm which is prepared with the help of rough set theory. The algorithm is implemented in the cloud simulator in which cloudlets, datacenters, cloud brokers are created to perform the algorithms with the help of rough sets. The Ontology is the system consists of cloud services in which cloud service discovery system is maintained. At last there is the implementation of work done using the rough set in cloud simulator using net beans and sql as back end. The net beans is loaded with the cloud Sim packages in which some of the packages are prepared according to our algorithm and gives the expected output of the optimization using rough set as a new concept.