Abstract: The study aims to evaluate the suitability of climate conditions during the growth and development process of the middle- season rice in Hubei, serve government decision- making departments to carry out timely and reasonable field management, and finally to achieve the purpose of rational utilization of climate resources. The meteorological data and related agricultural meteorological indexes during the middle-season rice growing period by every ten days of Hubei were used to construct the membership function of ten day sunshine hours, average temperature and precipitation suitability degree during the rice growing period, three elements of climatic suitability for each ten day effect and their effect on yield were calculated, thus to obtain the variation characteristics of the climatic suitability degree of Hubei middle-season rice and build the model of the effects on yield. The results showed that: during the whole growth period of middle-season rice, light, temperature and water suitability were averagely suitable for many years, temperature suitability degree was the best, then was the sunshine suitability degree, precipitation suitability degree was the smallest, comprehensive suitability was remarkably stable, and it fluctuated around the average for many years. At the same time, comprehensive suitability of the 4 climatic regions selected were rather high in the early stage of middle-season rice growth, but low in the late stage of growth influenced by periodical high temperature and drought, and this was consistent with the actual situation. Simulation model of yield value from 1990 to 2010 was correlated significantly with the actual meteorological yield. It showed that comprehensive suitability model had a certain influence on the accuracy and feasibility of quantitative evaluation of three climatic factors: light, temperature and water.