Choke manifold is the necessary equipment to control kick and implement pressure control technology of oil and gas wells. When the blowout preventer is closed, a certain casing pressure is controlled by opening and closing the throttle valve to maintain the bottom hole pressure slightly higher than the formation pressure, so as to prevent the formation fluid from flowing into the well further. In addition, choke manifold can be used to relieve pressure to realize soft shut in. When the pressure in the well rises to a certain limit, it is used to blowout to protect the wellhead. When the well pressure increases, the fluid in the well can be released to control the casing pressure by opening and closing the throttle valve (manual adjustable, hydraulic and fixed). When the casing pressure is very high, it can directly blow off through the gate valve.