A nursing system of a visual evoked brain wave control device, measuring a brain wave signal induced by the user when gazing at one optical display region, for controlling external devices is designed. The optical flash generating device receives an outer signal to flash the optical display region therein. A brain wave signal measurement device is used to measure a brain wave signal induced by users when gazing at the optical display region. A programmable chip is used to analyze the relation between the brain wave signal and the optical flash generating device, and control a selected option of the optical display region gazed by the users (for example, raising/falling of first, second or third portion of the hospital bed, volume adjustment of radio, channel adjustment, etc.), for improving the independence capability and the life quality of the users.