The dual-wavelength (1047nm and 1064nm) laser based on the Nd:YVO₄/Nd:YLF combined crystal is designed.The rate equat ion of the dual-wavelength laser with the combined crystal is analyzed theoret ically,and the temperature characteristics of the dual-wavelength laser with fi xed pumping power condition are investigated experimentally. During the experiments,setting the pumping power at 600mW,and rising the heat sink temperature of the combined crystal from 7.0℃ to 22.0℃ by step of 1.0℃,the dual-wavelength laser signals with frequency separation from 4.58THz to 4.63THz and tunable power balance level are achieved.In the range of the heat sink tempera ture rise,the maximum frequency separation is at 8.0℃,which is measured as 4.63THz,and the minimum frequency s eparation is at 21.0℃,which is measured as 4.58THz.The experimental results show that the variation of freque ncy separation with heat sink temperature was stable around 4.60THz.When the heat sink temperature is kept at 17.8℃,the power balanced dual-wavelength laser signal is realized with frequency separation at 4.58THz and output power at 18.48mW. Such a dual-wavelength laser with super-large frequency separation can be used for heterodyne beating to terahertz wave signal s.