High power fiber lasers are widely applied in industry and scientific research widely.However,it is often difficult to further increase their power due to the nonlinear effect,mode instability and other influencing factors.Studies have shown that stimulated Raman scattering (SRS) can induce mode changes of the laser in the fiber,and such mode aberration is mainly divided into two types:one is that SRS,through heat generation caused by quantum loss effects,induces dynamic temperature gradients,leading to the formation of thermally induced refractive index gratings,which in turn excites thermally induced mode instability (TMI).In addition,SRS can cause a quasi static mode aberration,and the mechanism involves the combined effect of fiber core pumping effect and inter model wave mixing (IM WM).Current research still faces issues such as incomplete matching between theoretical models and experimental results,and unclear mechanism of the transition phase between two types of mode instability.In view of the above problems,the physical mechanism of SRS TMI interaction and the latest progress are systematically analyzed,which provides theoretical references and research ideas for the optimization of the performance of high power fiber lasers.