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The thermal management is an important issue for AlGaN/GaN high-electron-mobility transistors (HEMTs).In this work,the influence of the diamond layer on the electrical characteristics of AIGaN/GaN HEMTs is investigated by simulation.The results show that the lattice temperature can be effectively decreased by utilizing the diamond layer.With increasing the drain bias,the diamond layer plays a more significant role for lattice temperature reduction.It is also observed that the diamond layer can induce a negative shift of threshold voltage and an increase of transconductance.Furthermore,the influence of the diamond layer thickness on the frequency characteristics is investigated as well.By utilizing the 10-μm-thickness diamond layer in this work,the cutoff frequency fT and maximum oscillation frequency fmax can be increased by 29％ and 47％,respectively.These results demonstrate that the diamond layer is an effective technique for lattice temperature reduction and the study can provide valuable information for HEMTs in high-power and high-frequency applications.