The CO2 laser point-by-point exposure technique is used to fabricate a long period fiber grating (LPFG) operating at 2 μm, and the transmission characteristics are also been experimentally explored. The influences of grating writing parameters including grating period, modulation depth of refractive index and number of grating period on characteristic loss peak at 2 μm waveband are studied. The simulated and experimental results show that the resonance center wavelength and resonance peak depth of LPFG at 2 μm are tuned by grating period and grating length, and laser scanning times and refractive index modulation will increase the coupling strength of the mode within the fiber. In addition, the temperature-sensitive property of a 2 μm LPFG is also explored and the sensitivity is measured to be 74 pm/℃ via the designed experiment. It is believed that this work possesses potential application value in the development of 2 μm fiber lasers and their key devices.