Abstract: In this paper,weintroduced a kind of ageost rophic ω equation suitable for the analy sisin a lower layer aimed at the summer heavy rain system in China,it is different from all kinds of ω equation limited by balance equation till today.It includes diabatic heating factor and friction effect in lower layer.All force field can be written by a simple vector (Q*) divergence suit able for the operational analysis and forecast application,the test and experiment show that the applied result was satisfied.