The PTH-IRAM in 30 cases and the serum calcium in 23 cases with chronic renal failure are determined to be 13.04±10.32pmol/L and 2.08±0.22mmol/L respectively.Among the 30 cases

there are 22 cases（73.33%） to present the elevation of PTH-IRAM

and among the 23 cases there are 17 cases（73.91%） to show the decreasing tendency of the serum calcium. In 17 cases

there is a remarkable negative correlation（|r|=0.486）between PTH-IRAM and the sertun calcium

while blood urea nitrogen and creatine show remarkable positive correlation （|r|>0.482） with PTH. All of these show a very close relationship between PTH and the function of the kidney. In conclusion

to check PTH-IRAM and the serum calcium at the same time is of great value to judge the function of the kidney and to evaluate clinical therapeutic effect.