Objective To investigate the sleep condition and its influence factors in old patients with hypertension. Methods A total of 100 old patients with hypertension were investigated by Pitts-burgh sleep quality index (PSQI) and serf-designed questionnaire of influence factors. Results 76 per-cents of the old patients with hypertension had sleep disorders.The total score of PSQI,sleep quality,time take to fall asleep,hours of sleep,sleep effficiency,sleep disorders,hypnotic drugs and every score of daytime dysfunction were significantly higher than domestic norm(P<0.01).Surroundings(strange circumstances or noisiness), physio-pathology (disease distress or high frequency of going to toilet during nighttime),psycho-logical situations(the fear to the disease or worrying about medical fees) and drags(use of diuretics or the adverse effects of some antihypertensive agents) were the important factors affecting sleep quality. Con-clusions Old patients with hypertension have poor sleep quality,which relates with multiple factors.Valid nursing interventions should be adopted in order to control the various factors which affect sleep quality to improve patients' sleep quality.