Objective The HIV incidence rate was studied among the injection drug users in Xichang of Sichuan province with a mathematical model.
Methods The basic data were obtained by cross-sectional studies among the injection drug users.A HIV mathematical model was analyzed.
Results The HIV mathematical model was introduced.The HIV incidence rate was estimated.
Conclusion By the model, the HIV incidence rate is λ=3.5%, which is close that by the cohort study.