Abstract: Athree-dimensional puffmodel has been proposed to simulate diffusive chara cteristics of seeding agents seeded along non-vertical direction of wind within stratifor mis. In order to agree with actual processes, effectsof topogr aphy and vertical wind shear on diffusion, tempo-spatial variations of seeding param eters, and wet deposition were taken into consideration. Moreover, a three-dimensional no nhydrostatic meso-β-scale model has been form ulated to simulate the fields of at mospheric flows and tur bulence, which can be input to the puff-model as backg round field for improving its accuracy.