According to the spirit of "a moratorium on the use of self-priming filtered gas masks notice" published by State Administration of Grain, Seminar about usage effect of security protection special instruments in grain storage enterprise was held by the National Engineering Laboratory of Grain Storage and Transportation on July 10, 2012. The topic of the meeting mainly focus on the grain storage enterprises to further improve the safe production level of protection, guidance grain storage enterprises operating in dangerous places and effective protective measures. The conference is hosted by Professor Cao Yang, the deputy director of National Engineering Laboratory of grain storage and transportation, a total of 30 people attended the meeting. At the meeting, Professor Cao Yang describes the background of the meeting as well as the situations and the needs of safety production in China's grain storage industry. Responsible person or behalf of the following units which were Beijing Fortune Draeger Safety Equipment Co., Ltd; Hanwei Electronics Co., Ltd of Henan; Xinhua Protection Equipment Co., Ltd of Shanxi; Naisheng industrial equipment Co., Ltd. of Shanghai; Chemical Plant Co., Ltd. of Tangshan; Research Institute of Chemical Defense of the Chinese People's Liberation Army; the brazing leopard Lecco trade Co., Ltd. of Beijing; the MSA security equipment Co., Ltd. (China), talked on the meeting respectively. They introduce the technical principles, features, applications, and sales of their products including positive pressure air respirator, positive pressure airfilter self-priming gas masks, new self-absorption filter respirators, the variety gas detector and gas sensor products etc.