Objective To study the clinical effects of "Reinforcing Qi and Activating Blood" in the treatment of stable chronic obstructive pulmonary disease (Qi Deficiency and Blood Stasis Syndrome). Methods This study recruit 50 outpatients with stabe chronic obstructive pulmonary disease (Qi Deficiency and Blood Stasis Syndrome), who were randomly divided into 2 groups, control group and treatment of "Reinforcing Qi and Activating Blood" group. The patients in control group were given conventional treatment, while the patients in treatment group not only received conventional treatment but also the treatment of Yu-Ping-Feng capsules and Fu-Fang-Dan-Shen tablets for 3 months. The duration of follow up was 12 months, and chinese medicine (CM) symptoms, cellular immunity indexes and haemodynamics indexes were assessed every 3 months. Results The total effective rate in treatment group at 3 months treatment and 3 months follow-up were higher than that in control group(PPPPP>0.05), while the level of endothelin (ET) was significantly different (PP
