Because of its initial advantages,high power laser has been more and more widely used in the field of industry,military,medical and so on.Then the fiber which can be used for energy transmission attracts a lot of attention.Transmitting energy fiber has the advantages of flexible transmission,simple mechanism and better adaptability to environment and it is especially suitable for complex systems and limited occasions.When the laser wavelength is longer than 1.7 μm,the transmission loss of traditional silica fiber will increase sharply,so it is difficult to meet the basic requirement of energy transmitting fiber,then infrared energy transmitting fiber shows great potential because of its excellent performance.Therefore,a large number of researches have been carried out on the properties of infrared energy transmitting fiber,including:fiber coupling conditions and methods,factors of coupling efficiency and transmission efficiency,damage mechanism and damage probability of infrared energy transmitting fiber and so on.As the research going,the transmission efficacy available today is enough for some applications,but it needs to be improved continually for more widely application.