Examine the key points you made throughout your research paper. The number of key points depends on how extensive the topic is and the paper's length. An extensive topic probably has many key points.
Write each key point while constructing the first draft of your conclusion. This will give you a list of each point that you made.
Summarize all of the key points from your list into one or two paragraphs in the conclusion. Tie them together so that they give the reader a sense that the paper is complete and that she has all information necessary on the topic.