1. Accuracy: Ensure that the quoted chart information is accurate and avoid misleading readers. Before quoting, you should carefully check the data, units and labels of the chart.

2. Integrity: The cited chart should contain enough information so that readers can understand the content and significance of the chart. If necessary, you can briefly explain or explain the chart when quoting.

3. Reference format: According to the reference format used (such as APA, MLA, etc.). ), refer to the chart source correctly. Information such as author, publication year, article title, journal name, volume number, issue number and page number are usually required. Also indicate the type (such as histogram, line chart, etc.). ) and chart number (if any).

4. Copyright: When using other people's charts, you must abide by relevant copyright laws and regulations. If possible, it is best to obtain the consent of the original author or publisher. When quoting, you can indicate "image source: [author/publisher]".

5. Chart quality: Try to choose high-quality charts as reference objects, and avoid using charts with unclear or incomplete data. In addition, if possible, you can choose charts published by journals with wide recognition and authority.

6. Relevance: ensure that the cited charts are closely related to the theme and research content of the paper. Avoid quoting charts that have nothing to do with the paper or have little to do with it, so as not to distract readers.

7. Appropriate citation: Appropriate citation of charts in papers to avoid excessive use of charts. Too many charts may make the paper appear cumbersome and affect the overall quality of the paper.

8. Originality: When writing a paper, try to avoid directly copying other people's charts. If you really need to quote other people's charts, you can try to modify or adjust the charts to some extent to reflect your originality.