There is no such thing as the fastest way to lie flat on your back and not be able to urinate after surgery. Usually can take general measures and other treatments, general symptoms of light people do not need special treatment. 1. General measures: after surgery lying on the floor can not come out of urine is mostly considered to be caused by anesthesia, the patient at this time can listen to the sound of water to induce urination, you can also use a hot towel on the abdomen for hot compresses, to promote local circulation, which will help the discharge of urine. 2. Other treatments: if the patient because of urine out, and obvious swelling, if necessary, need to cooperate with the doctor to take catheterization. However, in general, for the postoperative discomfort is relatively mild for patients, no special treatment, after the anesthesia effect disappears, can gradually return to normal urinary function. In addition, some patients are unable to urinate in bed due to psychological factors such as unaccustomedness and shyness, and should be assisted in urination by psychological counseling and avoidance of family members. In short, after surgery, patients who can not urinate lying down need to cooperate with the doctor to actively deal with, so as not to delay the condition, resulting in adverse consequences.