Abstract: Laser amplifers are a main means to obtain high power and high energy laser.Laser amplifers are generally pumped by several flashlights in order to increase the output energy.It is critical to design a reasonable cooling means to amplifers for operating at high gain,excellent gain homogeneity,high rate,long lifetime,static and dynamic distortion as possible as small.In the paper,tentative research results on cooling of laser amplifer are presents.