Health literacy refers to "the extent of an individual to the capacity of obtaining, processing, and understanding of the basic health information and services required to make appropriate health decisions." Many studies have confirmed that health literacy is an important factor affecting a person's health. People with poor health literacy are at high risk for poor health consequences. Shallow health literacy is associated with higher medical costs and expenses. Apart from the issue of health literacy influence a person's ability there is also the affection from complexity and difficulty of health care environment information. In order to resolve the matter of people's health literacy, we can start from health care institutions and professionals to provide friendly care and resolve people's health literacy situation. The main purpose of this article is to introduce the evolution of the concept of health literacy, and hence illustrate how healthcare organizations and healthcare professionals can provide health-literate friendly care service.