The adherence rate (95%) to HAART in the intervention group which receives a phone call will be higher than that(75%)of control group which does not receive a phone call.

According to above eligibility criteria, getting two eligible group patients, one which are patients newly required HAART (new cases) and the other who have received HAART for 1-3 years(old cases). All eligible patients in each group will be randomly assigned to intervention and control group by block randomization. Among of them, one group with a phone call intervention, the other without. New cases will be followed up for 3 months and study outcomes will be assessed at the baseline and the 2nd week, the 1st month and 2nd month, and the 3rd month. For the old cases, study outcomes will be assessed only at the baseline survey and at the 3rd month.

Inclusion criteria:

• Chinese patients with HIV/AIDS aged ≥ 18 years and for the newly required HAART patients, mainly based on their CD4 < 350 cells/mm3. But irrespective of CD4 cells for old patients who are under treatment for 1-3 years.

Exclusion criteria:

• Patients who have the inability to communicate at the beginning of study and who haven't got opportunistic infection(this item is only for new cases), who are non-Baoshan registered residence, who are foreigners, prisoners and pregnants, who have no mobile phone.