Because gas production in gas cap reservoirs is not stable,it can't be used as the fuel of platform gas turbine power station, so the storage and transportation cost of offshore oil field is high.Therefore, in the process of developing offshore gas cap reservoirs, the development mode of gas control should be used to reduce energy waste.The AICD inflow control device, based on the Bernoulli principle, can delay the gas break through, and after the well gas break through, it can restrict gas flow into the wellbore. AICD technology in Norway Troll oil field is applied successfully.At the same time, the production gas oil ratio of the AICD wells is one-third that of the unused AICD wells, and cumulative oil production is increased by 20%.Aiming at the gas cap and bottom water heavy oil reservoirs in Bohai Q oilfield,the multi-well model of ECLIPSE is used to simulate the AICD technology of horizontal wells.The calculation results show that the ACID device effectively reduces the gas oil ratio from 1 000～2 500 m³/m³ to 500～1 000m³/m³, and the accumulated oil increases by 12% to 15%.Horizontal well combined with AICD gas control technology can provide a new way for the development of offshore gas cap reservoir, and it has broad application prospects.