To minimize the impact of shale gas drilling on environment to the lowest level, the key technologies for drilling is formed in Fuling shale gas field by technology program optimization and field practice exploration. This paper analyzes the impact of shale gas drilling on the environment in Fuling area starting with horizontal drilling characteristics and environmental features there. On this basis, “green” drilling technical system is constructed with core of oil-based drilling fluid recycling, harmless treatment of oil-based cuttings, converting oil to electricity, drilling design and construction technology optimization as well as “well factory” pattern drilling. This technology was popularized and applied in the first phase production of Fuling shale gas field, carban dioxide emission is reduced 209 thousand tons, well site area is reduced 30% with zero pollution and zerp emission.