Abstract: The development and application of the cloud and seeding models in weather modification are introduced. The cloud models include bulk water models and bin models, The seeding models involve three types of seeding materials:glaciogenic materials, hygroscopic particles and coolants. Some of these models are coupled with meso-scale models. The cloud and seeding models are widely used in research works of rain enhancement, hail suppression, for dissipation, rain reduction, and are in important role in operational field weather modification activities.