The proportion of elderly people is steadily rising worldwide, with the most rapid growth in low-income and middle-income countries. Chronic kidney disease (CKD) is a common disorder in older people. However, less is known about the epidemiology of CKD among elderly persons and its relationship with adverse consequences. This study aims to carry out a multicenter epidemiological investigation among hospitalized elderly patients with CKD, providing important information for clinical guidelines and healthcare policies in elderly patients with CKD. We obtained patients’ medical records from a national-wide database including 18 hospitals across China (from 1 January 2009 to 31 December 2011). Only data from adult patients (aged 18 years of older) were included. ICD-10-CM coding system was used as the diagnosis of the disease. The characteristics of CKD in the elderly, including etiology of CKD, pathological types, comorbidity conditions, and in-hospital mortality, were compared with those in younger patients. Logistic multivariate regression analysis was used to identify independent risk factors for death. A total of 380,461 patients were included, of whom 154231 were elderly patients. Among the elderly 6966 were diagnosed as CKD. The top three causes of CKD among the elderly are diabetic nephropathy, hypertension-related renal impairment and primary glomerular disease, accounting for 24.1%, 20.9%, and 11.1%, respectively. Among the elderly patients with primary glomerular disease had a pathological diagnosis, membranous nephropathy is the most common type (54.6%), followed by IgA nephropathy (36.1%) and mesangial proliferative glomerulonephritis (13.6%). 71.6% of the elderly patients with CKD had more than two comorbidities. The in-hospital mortality rate of the elderly with CKD was 3.3%, which was significantly higher than young patients (1.0%). Logistic regression analysis showed age (OR=1.086, 95%CI 1.064-1.108), CKD Stage 5 (OR=2.708,95%CI 1.988-3.787), acidosis (OR=4.430,95% CI 2.223-8.827), cardio-cerebrovascular disease (OR=2.301,95%CI 1.701-3.113), infection (OR=1.867,95%CI 1.124-3.102), tumors (OR=3.782,95%CI 2.434-5.876), dementia (OR=8.281,95%CI 1.593-43.037 were independent risk factor for death among elderly patients with CKD. The CKD etiology of elderly is different from that of non-elderly. Diabetic nephropathy and hypertension-related renal injury are the first two common causes, followed by primary glomerular disease. More than 2/3 of the elderly CKD have comorbid conditions, and the number of comorbidities increased with age.