While it's not possible to spot reduce (reduce fat in specific areas of your body by doing more exercises for that area) doing a certain type of cardio will better target abdominal fat. Cardiovascular exercise that is high in intensity and duration better reduces abdominal fat than moderate cardio will.

You can find information on high intensity (HIIT) cardio in the General exercise forum, or by using the "search" function on this forum.

HTH
Nat