Facing the development and construction engineering of China's first large gas field with high H2S content and ultra depths, on predecessors' bitter lesson basis, we adhered to the scientific concept of development and adipted a new security concept to fulfill the system engineering, and highlight concept change, standards, supervision and other links. As a result, systematic technologies of safety engineering and development of gas field with high H2S content have been formed, which ensured that the development construction project of Puguang Gas Field can be successfully completed.