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This study is a quasi-experimental research with aim of evaluation the effect of respiratory exercise in acute respiratory complication and the length of time patient hospitalization undergoing coronary artery bypass surgery in Kermanshah Emam Ali hospital in year 2000 The study subject consisted of 60 patients (42 male and 18 Femal), with age rang between 30-70 years old, who were eligible for this study. The subjects were selected with convenience sampeling and randomly allocated to two groups (Experimental and control). Experimental group received education in two sessions of videoteaching and control group recived routin cares. Tools of data collection consist of demographic questionnaire, clinical records, check list and respiratory exercise. Results revealed: The incidence rate of atelectasis in experimental group was (26.7%), less than contral group (%56.7), test showed significant difference between incidence rate of atelectasis (P = 0.01). Therefore the length of hospitalization in experimental group was less than control group (P=0.02). Accomplishment of post operative respiratory exercises in all samples were lower than doing exercise pre-operatively, and the highest score for effective exercise and coughing were in two and three days after surgery (P=0.000). The result of this research reveales, videoteaching is effective in promoting nursing care and self care in clients.