1。 First-class target population: refers to people who are expected to take suggested health behaviors directly after receiving education. For example, in the breastfeeding community health education program, pregnant women and nursing mothers; Health intervention to prevent stroke is a group of hypertensive patients.

2。 Secondary target population: refers to people who are closely related to the primary target population and have certain influence on their beliefs, attitudes and behaviors.

For example, in the breastfeeding community health education project, husbands, parents, relatives and friends, pregnant women and nursing mothers' companions; Family members, patients and medical staff of patients with hypertension are all involved in health intervention to prevent stroke.

3。 Third-level target population: refers to people who have great influence on the implementation and success of the plan.