Research statement is one of the important documents in the process of applying for faculty positions, particularly required by research schools. The purpose of it is to showcase your journey in terms of doing research: the past, present and future of your research, in addition to the potential benefits to the community. Research statement is considered as a complementary documents to CV. The latter includes brief description of achievements, projects and essential information such as the name of your schools. Research statement though involves more details about the questions you have in your mind, why they are significant, and your strategies to address them. A winning research statement clarifies the path your research has taken, and where it will take you in the future, and ultimately convinces the search committee that you are a good fit.
One key point in developing an effective research statement is to introduce yourself as a mature competent scientist who aspires to run his/her own academic business independently. It is a fatal mistake to devise the direction of your research plan as a copy of what your current advisor does. The research committee seeks a creative scientist who has a clear short-term and long-term plans. Therefore, you should provide them with a persuasive, reassuring, realistic image of what their life will be like when you are working in their department.
Finally, do not forget to read the samples and observe the range of different approaches that can be taken credibly. It helps you to find your own style of writing.