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Background: the increase level of serum phosphate is common due to secretion failure of the kidney on chronic kidney disease patients (CKD). The study objective is to determine the level of serum phosphorus among the CKD patient on chronic dialysis in Gianyar Bali. Methods: a prospective cross-sectional study was conducted in 100 serum of the patient visiting dialysis clinic in Sanjiwani and Arisanti Hospital on October 2018. A three mL of blood was collected and the phosphate level was measured with specthrofotometer. Results: Sixty seven of 100 samples was man with mean age was 52,52 (SD±12,811). The most cause of CKD was pyelonephritis chronic. The mean of hemodialysis duration was 44,59 (SD± 32,40). Level of the phosphate more than normal limit found as high as 69% of the samples. There was a correlation between age (p=0.001), gender (p=0.020) and phosphate level, but there was no correlation between IMT, HD duration and phosphate level, accounting for p=0.222 and p=0.264, respectively. Conclusion High finding of hyperphosphatemia that found in the study reveal the presentation of CKD-mineral and bone disorder in CKD patients. Correlation of age with higher phosphate level may relate with the deterioration of kidney function in elderly.