Abstract: An improved container which collects the air samples was used and a new research method which can analyze the spraying droplets in groups in sealed interspace was put forward. By studying and analyzing the difference of the samples in both sides and selection of the sampling parameter combination, the best combined sampling parameters were obtained as follows: to use 5 minutes to sample and to take 5 L spraying droplets per minute. Based on the best combination, it is found that there are division points in the spraying deposition curve. The point appears 13 minutes after finishing spraying and 27 minutes after beginning the spraying. Based on this phenomenon, a spraying deposition curve fitting in diversion and a analyzing description were given. Using the improved container, the concentration data can be attained in 79 minutes after finishing spraying. While using the method mentioned in paper ［13］, the concentration data can only be attained in 45 minutes after finishing spraying. So the method mentioned in this article can supply more information describing the tail characteristics in the spraying deposition curve.