Abstract: As the cloud, structure is usually fluctuating, it is important to study the growth of the droplets under gravitational coalescence in such an environment. In this paper the growth rate of cloud droplet is calculated under the consideration of the fluctuation of the water content. The result obtained differs considerably from that obtained for the case without such fluctuation, and seems in better accord with the condition observed in the atmosphere. The growth rate is now much greater and the precipitation elements may even develop quickly from a group of small droplets of small dispersion in a cloud in a state of not intensive fluctuation.