Abstract: Hypotension's incidence rate in the hemodialysis in is 20%~40%,seriously afloat the sufferer's living quality of the hemodialysis.Therefore,thorough research hypotension of occurrence reason combine the establishment correspond of prevention measure.Be advantageous to raise the sufferer's dialysis quality of the hemodialysis and insure a dialysis sufferer dialysis process in of the safety have very important meaning.