Jiahua is the first company carrying out the research in SF6‘s decomposition products in electrical equipment and equipment state and the development of detection instruments in China. It is leading the industry for the diagnosis of the internal failure of SF6 electrical equipments and owns a number of patent technologies. During recent years, it has undertaken the compilation task of SF6 Electrical Equipment Gas Quality Supervision and Internal Failure Diagnosis, the training guidebook of State Grid Corporation of China, and the establishement of industrial standard, Detection Method of SF6 Electrical Equipment Decomposition Products. JH3000 series SF6 electrical equipment decomposition products detector also won 2007 Free Venture Fund of Ministry of Science and Technology of China. JH4000 series SF6 electrical equipment gas comprehensive detector can detect more components and has more powerful functions. It is verified by National Measurement Institute that its all performance indexes meet the design standard and conform to the requirements of national standard related to the electrical and ambient condition of electronic instruments.