Research and Analisis for the qualities of chest films of emergency cases were completed in order to produce a valuable one of diagnostic necessity. It is resulted as follows; 1. Among the 3,505 cases of chest films, 47% of them was poor conditioned the reason was fowned as of unsuitable exposure. 2. It become the same condition when we increased 11.4% of KVp in full exhalation compare with the full inhalation of erect position and 20% after full exhalation and 4.3% after full inhalation in supine position. The result was that no difference between prone position and supine position was fowned. 3. When respiration volume is different, proper control of KVp is extremely needed.