Abstract：The author discusses constipation after spinal cord injury mainly from three aspects：etiology，pathogenesis， and therapeutic methods. It is certain that constipation after spinal cord injury falls into the category of flaccidity syndrome and constipation. As for its etiology， damaged governor vessel contributes to the disease， and constipation is caused by dysfunction of kidney qi. Combined with ZHU Danxi's theory of flaccidity syndrome and constipation，the author holds that ZHU Danxi's method of “purging heart fire to nourish renal water，tonifying yin and moistening dryness” can be applied to the treatment of constipation after spinal cord injury. If the additional medicine of unblocking governor vessel and dredging the bowels was applied，the curative effect can be enhanced.