In this paper,Fe 2+:ZnSe crystal with the size of Φ 50.8mm×120mm is grown by using 99.999% granular ZnSe as the substrate material and 99.998% purity FeSe powder as the dopant through high pressure vertical Bridgman(HPVB)method.The iron ion doping concentration in the Fe 2+:ZnSe crystal sample is 3.048×10 18cm -3,which tested by the inductively coupled plasma emission spectrometer.The X ray diffraction spectrum of Fe 2+:ZnSe crystal sample is investigated by the powder XRD diffraction instrument,showing a matching degree between the diffraction peak and the crystal sample is 92%.The transmission spectroscopy of Fe 2+:ZnSe crystal sample is measured using a UV/VIS/NIR spectrophotometer and a Fourier infrared spectrometer,presenting a significant Fe 2+ ion absorption peak at a wavelength of 3.0μm.A 2.94μmEr:YAG laser is used as the pump source to pump a Fe 2+:ZnSe crystal sample with a size of 10mm×10mm×4mm.When the repetition frequency is 100 Hz,the laser energy output reaches 12 mJ,and the output wavelength tuning range is 3.95～4.15μm.