Objective To observe effect of home nursing on prevention and control of asthma. Methods Emergency patients(85 cases) were divided into the treatment group(42 cases) and the control group (43 cases).The control group received routine medical treatment after emergency management.The treatment group was given family intervention based upon routine medical treatment,the family intervention included regular visits or telephone followup,short message or internet multimedia, etc.These interventions supplied correct medication method,self-monitoring of asthma, self first-aid at acute attack,how to seek medical emergency treatment and psychological support,ete.The followup continued for 1 year. The asthma control test (ACT) was adopted to compare the clinical effect of the two groups. Results The control rate of the treatment group was greatly improved compared with that of the control group (P < 0.05). Conclu-sion Family intervention played a pivotal role in the improvement of control rate of asthma.