From June 7th to 9th, the sixth working group conference of the international standardization technical committee of mechanical safety(ISO/TC199/WG6) is held in Nanjing. The chairman of the ISO/TC199 Mr. Otto Görnemann, the secretary of the ISO/TC199 Mr. Hauptvogel Andreas and more than 20 domestic and foreign experts from China, Germany, the United States, Britain, Sweden, Japan and so on. Director of CQCEx Wang Xinhua who is the working group leader of SAC/TC208/WG9 is present this conference.