Considering the influence of high-order dispersion and high-order nonlinearity on quasi-soliton transmission,the effects of third-order dispersion,self-steepening and ISRS are investigated by numerical simulation. The result indicates that among these three effects,the influence of the ISRS effect on quasi-soliton transmission in the actual fiber is primary. Under the influences of these effects,the width of quasi-soliton broadens,the peak value of the pulse descends and the shape of the pulse cannot keep as the original shape.