Abstract: Heavy oil reservoir in Bohai A oilfield has the characteristics of high viscosity and poor efficiency of cold production. Based on the analysis of multiple thermal fluids stimulation, numerical simulation of it has been carried out and the parameters have been optimized. Aiming at the deployment of development well pattern, the whole FDP has been established which can make a prediction of the development effect. The field pilot testing indicates the optimized multiple thermal fluids stimulation can efficiently improve oil well productivity and therefore provides guidance for development modes change of offshore heavy oil reservoirs.