As the key component in the WDM network, the acousto-optic tunable filter (AOTF) is broadly used in the field of optical communications and optical interconnections. But an obstacle in its application is its frequency draft along with the change of the temperature. In this paper, the temperature property of the AOTF has been analyzed theoretically. The calculation shows the temperature draft of 0.8 nm/℃. Additionally, a set of PID temperature control system is fabricated, to successfully stabilize the temperature of the AOTF within ±0. 1℃. The temperature property of AOTF is also measured by the PID system. The results agreed with the theoretical analysis very well.