Aim To investigate the levels of calcium and phosphorus disturbance and intact parathyroid hormone （iPTH） in maintained hemodialysis（HD） patients. Methods The study included 98 patients，who were on haemodialysis treatment for 3～192 months. Patients in a group were subdivided into dialysis age ＜12 months group and 12 months＜dialysis age ＜36 months group and dialysis age ≥36 months group. iPTH level and clinical data were compared among the groups. Results Serum iPTH was significantly higher in dialysis age ≥36 months group than that in dialysis age ＜12 months group and 12 months＜dialysis age ＜36 months group（P<0.05）. iPTH level was significantly lower in diabetic patients with short dialysis age（dialysis age ＜36 months） than that in nondiabetic patients （P<0.05）.