ased on the average depth's momentum equation of two dimension which observe the momentum conservation,the numerical simulation of velocity distribution in aha reservoir is presented. According to the property of pollutant while they are in convective diffusion or transplant and degradation, the model simulates organics convective diffusion and heavy metal transplantion. In the end, some forecast are presented for typical organics and heavy metal pollutant at abundant season and medium season in the future of ten years and some proposal are given for dispose.