Abstract: The occurring condition of phase transformation and tiny jet stream in the pipeline transportation of paste-like fill is revealed theoretically.The analysis results demonstrate that the impace of tiny jet stream with high frequency and pressure in phase transformation can cause the “Dot Abrasion”of the pipe wall,leading to the fatigue and failure of pipe.The situation of “Vacuum Drying”or“Coarse Material Accumulation”caused by tiny jet stream action will compromise the normal transportation of paste-like.