The dialysis period, plain roentgenography, hemological tests and bone mineral content were studied dividing bone scintigraphic patterns in 120 dialysis patients due to the chronic renal failure into 5 groups (A-E). Moreover, variations of its patterns in 103 patients in whose chronological changeable observation is available were studied. In group A (6 cases) observed strong accumulation in the cranial bone and jaw bone by bone scintigraphy, salt and pepper signs in the cranial bone by plain roentgenography, high level of PTH and ALP, and swelling of parathyroid gland in all cases were detected. In group B (11 cases) being sporadically observed hot spot by slightly high background and group C (33 cases) without observing hot spot by high bakground, fracture and pseudo-fracture were observed by plain roentgenography. The similar results in both group B and group C were observed by hemological tests. The transfer from group E to others or from otheis to, group E, and mutual transfer of group B and group C were chronologically observed. In group D (6 cases) being acrresponded with accumulated site was observed by plain roentgenography. In group E (64 cases) showing normally accumulated pattern, cases revealing fracture and pseudo-fracture were observed by plain roentgenography. The transfer in other groups in majority cases, and transfer from group B and group C in some cases were chronologically observed. From the above-mentioned results, classification of the bone scintigraphic patterns and its chronological observation were oonsidered to be very useful for evaluation of the pathology and variation of osseous lesions in dialysis patients.