Introduction: The calcium-phosphate metabolism play an important role in the live of children deciding on the structure and growth of the skeleton. Calcium-phosphate disturbances are serious complication in children with chronic kidney disease during dialysis. Objective: The aim of the study was to assess calcium-phosphate disturbances in dialysed children in the first two years of renal replacement therapy. Material and methods: The study group consisted of 32 patients, 25 male (78%) and 7 female (22%), including 27 peritoneal dialysis (84%) and 5 (16%) – hemodialysis patients. Age of children at the inclusion of renal replacement therapy ranged from 1 month of age to 235 months of age. The study was conducted as a retrospective analysis of medical records of patients in the dialysis center for children. The period of analysis covered the years 2000-2011 and referred to indicators of calcium-phosphate homeostasis, the clinical markers of osteodystrophy, clinical data in the 3-month intervals and also assessed available pharmacological treatment. Results: We didn’t observed significant differences in the most of analyzed parameters in calcium-phosphate homeostasis. Mean values of these indices for two years of analysis remained at the recommended level. Only the alkaline phosphatase activity rose during the observation period as the concentration of bicarbonate did. Among the phosphate binders, calcium carbonate was used most frequently. The percentage of patient treated with active metabolites of vitamin D increased significantly up to 100%. Conclusions: The efficacy of treatment of calcium-phosphate metabolism in children on dialysis is sufficient to maintain the recommended values of all biochemical indices in minority of patients. They require significantly higher number of drugs. However, clinical consequences of renal osteodystrophy were rare in the study period.