Objective To investigate the level and contributors of self-concealment in bladder cancer patients underwent cutaneous ureterostomy. Methods A total of 184 participants were investigated by using a general data questionnaire,the Self-Concealment Scale, Event Related Rumination Inventory and Social Impact Scale. Results The samples scored 30.97±6.27 on self-concealment. Self-concealment was positively correlated with intrusive rumination and stigma, whereas negatively correlated with deliberate rumination（P＜0.01 for all）. Multiple stepwise linear regression analysis showed that stigma level, rumination level, education background, age and acceptance of ureterostomy were the influencing factors of self-concealment (adjusted R2=0.589, P<0.05, P<0.01). Conclusion The self-concealment of bladder cancer patients underwent ureterostomy is at medium level and is affected by many factors, so nurses should carry out individualized intervention measures targeting the influencing factors to reduce their self-concealment.