Abstract: Objective To analyze case detection rate among close contacts of smear positive pulmonary tuberculosis patients, and to provide suggestions for future early case detection work.Methods Among 16145 people consulting for TB clinic, 5121 were close contacts of smear positive pulmonary tuberculosis patients from 2009 to 2012 in Taoyuan County. And we made descriptive analysis on type, age, sex, symptoms, sputum smear results of these close contacts.Results Among the 5121 close contacts, a total of 58 tuberculosis patients were detected with the detection rate of 1.13% (58/5121), and the annual rate of 0.75%-1.69%. 24 of them were checked out from family members(the detection rate is 0.59%(24/4079)),and the checking out rate among none-family members is 3.26%(34/1042), and the difference is statistically significant(χ²=14.967,P<0.01). The smear positive rate accounted for 46.55% (27/58) and 53.45% (31/58) for smear negative, and the difference is not statistically significant (χ²=1.210,P>0.05). In terms of age group, no one was checked out among those under the age of 20 and highest among those over 60(3.23%(31/960)), and the difference is statistically significant(χ²=47.747,P<0.01). In terms of gender, the detection rate is 1.85% (47/2543) among males and 0.43% (11/2578) among those females, and the difference is not statistically significant (χ²=1.011,P>0.05). As for whether with suspected symptoms, the rate is 0.04%(2/4676) among those without any symptoms and 12.58%((27+29)/445) among those with suspected symptom, and the difference is statistically significant(χ²=1101.950,P<0.01).Conclusion Extensive publication of national tuberculosis prevention and control policies, close contacts and other key people check, will benefit the early detection of tuberculosis patients and reducing the epidemic.