Introduction: Sort the family health strategy (FHS) as to the level of HIV/aids prevention and check the Association of demographics variables with levels of prevention. Method: This is a cross-sectional study, quantitative, performed with 257 professionals working in the family health strategy in the northeast of Brazil. The data were collected using a form of structured interview during the period from August to December 2014 and analyzed through descriptive statistics and inferential statistics. Results: It was identified that the doctors, nurses, community health agents and technicians are highly preventive nursing, while coach of oral health and dental practitioners are few and moderately preventive respectively. The variables, female, income above minimum wage, Catholic religion, be married, working only on family health strategy, average age of 40.36 years and average time of professional activity around 9.56 years were associated with highly preventive character among the professionals interviewed. Conclusion: It was the need for greater investments in prevention of HIV/aids on the family health strategy, especially in the preparation of professionals.