Objective To study the common pathogenesis of the vessel diseases.Methods The epidemiological study was carried out on 3469 patients with vascular diseases

the TCM syndromes were diagnosed by using the entropy-based complex system partition method

the syndrome constituent ratio was calculated

and the structural equation model was set up for studying the causality among the syndromes.Results There were 8 common syndromes in 3469 patients.Collateral-qi stagnation syndrome was 31.94%.Collateral-qi deficiency syndrome was 58.58%.Collateral-qi stagnation combined with collateral-qi deficiency syndrome was 9.48%.Blood stasis syndrome was 58.11%.Phlegm turbidity（fire） syndrome was 42.66%.Stagnation heat syndrome was 24.59%.Yin deficiency syndrome was 29.14%.Yang deficiency syndrome was 28.37%.Both collateral-qi stagnation and collateral-qi deficiency could induce blood stasis and phlegm turbidity while collateral-qi stagnation could also cause stagnation heat.Conclusion Collateral-qi stagnation and collateral-qi deficiency were the initiating agent

which existing in the whole process of vessel disease.Blood stasis

phlegm and stagnation heat were the pathological products and secondary causative factors as well.