Experimental results of laser diode lateral-pumped Tm,Ho:LuLF crystal 2-μm ring laser is reported. Using a ring cavity of six mirrors, the beam waist and diameter are determined after theoretically caculating the cavity parameters. And it is convenient for inserting Q-switch in the cavity. Three-direction lateral-pumping is implied for the better pumping homogeneity and getting high pulse energy laser. In the free running mode, when the pumping energy is 3.25 J, and the pulse repetition frequency is 1 Hz the maximum laser energy is 114 mJ per pulse with the optical efficiency of 3.5% and the slope efficiency of 8.0% in the system. In the Q-switched mode, when the pumping energy is 2.75 J, 35-mJ Q-switched laser with pulse duration of about 700 ns is obtained.