2.7~3.0 μm laser has important application value in medical and military fields.In this paper,the structure of energy level and the laser characteristics of Er∶YSGG crystal were briefly analyzed,and the 2.79 μm laser produced by Er∶YSGG crystal pumped by 968 nm LD is emphatically described.The laser has the maximum output power of 14.3 W at the pump frequency of 500 Hz,the optical to optical conversion efficiency reached 7.1 % and the slant efficiency reached 11 %.Meanwhile,tellurium dioxide (TeO2) is used as Q switch to realize the pulse output of 10 W,the activity ratio reaches 70 %,and the pulse-width is 63.18 ns,which is of great significance for the application of 2.79 μm laser in medium and long wave lasers.