Library Science is a profession that is full of people passionate about making a positive change in the library as well as in the world. And the information’s is to communicate users who are seeking information to disseminate in different aspects. Togetherly, Library and information science are the perspective of collection, preservation and tools of management library resources. Library software has become the most powerful tool for changing the environment of libraries from traditional way to computerized, from electronic to digitalize. Web OPAC is a medium which connect library user with library resources, which are available in the library. The paper highlighted some search strategy of Koha and LibSys, which are available in their Web OPAC and also showing the differences after retrieving the search result.