Abstract: An infrastructure cloud manages the infrastructure as a resource pool,enabling on-demand and dynamic resources provisioning according to resource consumption and service loads.This paper investigates the issue of adaptive resource provisioning for services in clouds.A model is proposed to predict cloud services’peak load and calculate the expected resources consumption.Resource of the best utility for the service is identified and allocated to the service.Simulation results suggest that the proposed adaptive resources provisioning model has a fair accuracy and stable performance.