A compact and wide-temperature Nd∶YAG laser and grazing-incidence amplifier are reported. Fiber-like Nd∶YAG crystal is used as gain medium and a vertical-cavity surface-emitting laser array(VCSEL) is used for the pump source. Cr4+∶YAG is used for passive Q-switch. In continuous-wave (CW) mode, a maximum output power of 1.808 W is achieved at the highest attainable absorbed pumping power of 5.47 W with an optical-optical conversion efficiency of 33.05% and the slope efficiency of 36.5%. In Q-switched mode, pulse with the shortest pulse width of 7.5 ns, single pulse energy of 87.1 μJ and peak power of 11.6 kW is obtained. Grazing incidence and double-passes amplification of laser with single pulse energy of 81 μJ and pulse width of 13 ns obtained by pulse-pump is investigated. With the maximum pumping power, the pulse energy of 0.88 mJ is obtained with the gain of 10.86 and the energy extraction efficiency of 19.44%. After amplification, beam quality turns into M2x=1.196 and M2y=1.307 from M2x=1.175 and M2y=1.248. This laser system is compact and air-cooled. The fluctuation of output energy is below 3% when the temperature ranges from 15 ℃ to 31 ℃.