We reported the technique and the application of the lumbar sympathetic ganglion block to the spinal cord injured patients in this paper. The result was as follows: Four of six patients (67%) received lumbar sympathetic ganglion block were effective and detrusor-urethral sphincter dissynergia was improved. We thought that this result was due to the relaxation of the internal urethral sphincter, because this region was abundant in α-adrenargic receptors and was regulated by the sympathetic nerve (lower abdominal nerve). We considered that lumbar sympathetic ganglion block was useful for spinal cord injured patients with severe incontinence due to the spasms of the internal urethral sphincter.