First, paper materials are not "apples" falling from the sky, and the determination of paper materials cannot be imagined by the brain alone. By collecting and consulting materials, we can be inspired, broaden our horizons, stimulate scientific thinking and creativity, or find out problems and deficiencies, thus producing the seeds of writing papers.

Secondly, by collecting information, we can know what the paper needs, what results will be achieved, what problems exist in the paper, what is the key to solving the problems, and the development trend in this field, so that our paper can stand at a higher starting point.

Thirdly, through data collection, we can understand some basic facts and viewpoints of the paper, as well as the research ideas and methods of other researchers on this issue, or learn from others' methods, or get inspiration from others' research ideas and methods, and develop and form our own new research ideas and methods.

Fourthly, the collected data may put forward some appropriate suggestions for the revision of the paper, making the revision of the paper more perfect and effective. Make up for the lack of knowledge reserve.