Abstract: According to the characteristics of reservoirs in pilot area of enhanced foam flooding and the status of water-flooding in west block of Chengdong oilfield, Canadian CMG numerical simulation software is used to optimize design of parameters of enhanced foam flooding such as injected slug size, foam concentration, polymer concentration and injection methods. A development plan is formulated based on these optimization results. When the development plan is implemented in the oilfield, it is expected to enhance oil recovery by 11. 64 percentage points and increase oil production by 138,500 t.