A valid passport and visa are required for entry. Visitors from certain countries: Kenya, Uganda, Rwanda and Tanzania are exempt from requiring visas. Check with the Burundi embassy in your country before you travel. Visas are issued at Burundi embassies abroad and at entry/exit points as well.
You indicate the type of visa requested (tourism, business, etc.) by presenting:
International certificate of vaccination against yellow fever
A return plane ticket or a booking
A valid passport. The passport must be valid for six months after the planned departure date from Burundi
An invitation from a resident in Burundi or a hotel booking
Two ID pictures and sixty Euros in cash (or $90 US dollars)

The tourism visa is valid for a one month period. It is possible to obtain a visa with multiple entries.
The visa is renewable at the PAFE (Police de l’Air, des Frontières et des Étrangers) in Bujumbura.
The cost is set as follows:
Transit Visa 40$ (72 hours)
Single Entry Visa 70$ per month
Multiple Entry Visa 90$ per month