With the eco-climatic adaptability data,the growth laws and indexes of navel orange in Guangan,Sichan Province are studied. And the distribution model of climatic factors is established,i.e. y=f(h,Ψ,l,β).Then based on the GIS data of 1∶250000 and GIS technique,the climatic division of Guangan navel orange production is made. The result shows that climatic condition in some sub-area is not adaptive to the navel orange production.