Objective It is to investigate syndrome distribution law in the patients with dysfunctional uterine bleeding (DUB). Methods The syndromes of 532 patients with DUB were analyzed by mathematical statistics to summarize DUB TCM syndrome distribution laws. Results DUB syndrome distribution showed that deficiency of blood heat syndrome were more common ( 19.2% ) , followed by Qi stagnation, kidney, blood deficiency, spleen and kidney deficiency, liver heat, spleen, kid-ney blood stasis, blood deficiency and blood stasis, Qi, hot and humid. DUB s...