First, the content results are different.
1. Summary: In the introduction, the result can be omitted, because there is a special section in the text to write the result, so it is not necessary to repeat it in the introduction.
2. Abstract: The main research results must be listed.
Second, the content size is different.
1, Introduction: The introduction can be shorter. In order to shorten the space, you can briefly introduce the importance, significance or problems to be solved in a certain research field in one or two sentences.
2. Abstract: The abstract contains only five sentences. The first sentence is hypothesis, the second and third sentences are research contents, and the fourth and fifth sentences cover research methods and results.