The medical quality becomes a very important issue of a scholar and the public opinion. The high quality medical service of patients center and customer direction already has been necessarily prepare conditions to get the best competition advantage of all levels hospital in Taiwan, now.¡CTherefore, all hospital manager believe that promote medical quality is the very important issue¡CThe medical service quality of Emergency Department plays the very important role in the whole hospital. The medical service quality indicator is acknowledged well trusty medical quality measurement tool. Donabedian point out that medical quality measurement is compose of structure¡Bprocess and outcome, and that the outcome quality indicator measurement is the trend¡CAsthma is one of the most common diseases among children. Because of rising morbidity, mortality and medical costs all over the world, asthma becomes a very important issue. So, The purpose of this study is to identify the key factors associated with the of outcomes quality. The example of Pediatric Asthma in a Teaching Hospital. Data take from the Teaching Hospital¡¦s TQIP database through 2003. There are 534 Pediatric asthma patients who are research samples and care take by 25 physicians. The research analyze patient¡¦s and physician¡¦s characteristic to described data, Correlation and Regression with SPSS software. Look for the characteristic what influence the outcome quality of Emergency Department. The outcome quality include that patient¡¦s state after the treatment, patient¡¦s stay time and unscheduled revisit to Emergency Department.¡CRegression analysis showed that. 1.patient¡¦s state after the treatment trend to be inpatient who care by experienced physician, younger, illness serious and reach on day shift. 2.patient¡¦s stay time longer who care by experienced physician, so that the consultations effectiveness should promote to reduce .patient¡¦s stay time¡C3.patient¡¦s stay time longer who younger, so that the staff take care more careful and pay attention to patient¡¦s condition change frequently¡Ato reduce uneasy of long-term stay in Emergency Department. 4.unscheduled revisit ratio in the study is 4.7%¡Abut not discover the correlation factor¡C Integrate above-mentioned¡Athe study find that ¡Aphysician¡¦s and patient¡¦s characteristic will influence medical outcome quality. The project hospital should with different influence factor to draw quality manage policy and stratagem, and improve Emergency Department quality will raise the satisfied degree.