The fact of that the water cement ratio is the chief factor when making concrete mix design of the airport pavement with this experiment is known.And the results of this research show that water cement ratio has a well linear relationship with the flexural strength of concrete,the grading and the compact extent of the aggregate are directly corresponding to the flexural strength of concrete for pavement.Through the experiment research on the influences of aggregate's absolute volume on the flexural strength,it is conducted that when the cement is fine and the concrete is well compacted,the more aggregate used,the higher the flexural strength of concrete.