In the data collection stage of quantitative research, researchers need to be trained, including: ① researchers should convene a meeting of all researchers to introduce the research background, explain the matters needing attention and explain the measurement tools in detail; (2) Each researcher must read through the questionnaire, ask questions, be explained by the researcher and be discussed by the participants; (3) Divide the investigators into two groups, simulate the investigators and the respondents respectively, and experience the details, questioning methods, time, etc. (4) Discuss and confirm the suspicious or unknown points, so that all investigators can form a unified understanding and questioning method for the questionnaire; ⑤ Divide the work among the investigators, and explain the time arrangement and contact information of supervision.