We compared the clinical results of 27 one-stage bilateral cementless total hip replacements. with the results of 20 two-stage bilateral cementless total hip replacements. The hospital time for patient in the one-stage group averaged 1 week shorter than the twostage group. The cost in patients of one-stage group was saved as much as 12.8% of that in two stage group. The anesthesia time, blood loss and ineideace of local and systemic complications were similar for two groups. We think one-stage bilateral cementless total hip replacements can be done in patients who have bilateral hip lesions and have no serious systemic medical problems.