Objective To explore serum ECP level of Xinjiang Uygur population and study the correlation of ECP with bronchial asthma,as well as their clinical significance in asthmatic patients in different degrees,so as to elucidate the role of ECP in the pathogenesis of bronchial asthma.Methods Between 2004 and 2005,123 Uygur asthmatics and 89 normal healthy controls with the same ethnic near Xinjiang Hetian region were investigated.The serum ECP were detected using a pharmarcia UniCAP 100 type instrument,pulmonary ventilatory function assessed by FEV_1 and PEF.Results Our data showed that the levels of S-ECP in moderate to severe asthma patients were significantly higher than in mild subjects and control group(P