AIDS/HIV is already a problem in current China.It suggests some new angles of view for sociological studies.1.We should change the traditional concepts and terms of sexual relation such as “premarital”,“extramarital”,“non\|marital” and “remarried” into “single\|partner sex” and “multi\|partners sex”.2.Every sociological theory should be tested by studying the detailed human behavior such as condom use,rather than use another one when a theory meets problems to explain detailed behavior.3.Could people be organized by their social network?If they could act socially as a whole substance,what are its differences with the traditional terms of class,stratum and group?4.Promoted by surveying secret HIV risk behavior,sociological method should be developed higher and higher from “questing” to “proving”, and to then “supervising/determining”.