Aiming at the problem of poor adhesion after the bonding of piezoelectric transducer of AOTF and the acoustooptic crystal, a method of adding a transition metal layer to improve the stress characteristics of the banding layer was presented through calculating the thermal stress distribution of the bonding layer of AOTF based on the thermal stress theory. When the thickness of the transition layer of Au film reached to 200 nm, the theory thermal stress between the bonding layer and acoustooptic crystal was reduced to -0.613 MPa and the adhesion strength of the coatings could be ensured. The test results showed that the 3 dB bandwidth of the frequency response increased with the addition of the transition layer, and the diffraction efficiency was increased by 2%~4%.