Do not use a question as the title. If you place the research question as your research proposal title, it will look extremely unimpressive. You will be given a chance to address your research question many times in different ways throughout your research proposal. Hence avoid using it as the title of your proposal.
A research proposal comprises of a title, an abstract, a literature review (in certain cases), an introduction, the discussion or the body paragraphs and the conclusion. The title, being the first part of the proposal document, is what gives the panel the first impression about your proposal content. For the same reason, it has to be unique, interesting and capable of generating curiosity in the reader. There are certain things you can consider in order to make your research proposal title impressive enough.
Writing a research Proposal/ Protocol The Research Proposal Title
This provides formatting tips to assist you in the general layout and design of a research proposal title page. It also contains general guidelines and further descriptions for the parts of a research proposal.