Abstract: A urine drainage and control device and system, and voiding method includes a urine inlet, a urine outlet and a bionic bladder unit. The bionic bladder unit includes a urine storage cavity connected to the urine inlet and outlet via a tube, and a first and second pressure sensing surface deforming with urine pressure in the urine storage cavity. A lower connecting tube has a first and second action area. In one aspect when force is applied on the action areas simultaneously, communication between the urine storage cavity and the urine outlet is ended. Other applications of force allows communication with the urine outlet. The urine drainage device senses the change of the urine pressure via the deformation of the pressure sensing surfaces, determines whether to conduct voiding according to the deformation level of the pressure sensing surfaces thus assisting a patient to void.