Abstract: For Bohai Q oilfields with high viscosity of crude oil,conventional water flooding development mode is difficult to make more efficient use of reserves,therefore,the multiple thermal fluid throughput are introduced to improve the development effect.Using numerical simulation method,optimization design of the multiple thermal fluid and injection parameter has been carried out and the reasonable injection parameters are:injection temperature of 240 ℃,injection speed of 210 m3/d,cycle injection of 4 200 m3 and soak time of 3~5 d.And the reservoir prediction of the overall development effect has been made,the research results show that compared with conventional water flooding,in the same development period,the application of the multiple thermal fluid throughput technology can be of improved oilfield recovery factor.