Boron contents of soil samples from navel orange orchards of 18 counties in Gannan were analyzed systematically using skewness coefficient,normal distribution,confidence intervals statistical and ArcGIS mapping methods.The results showed that boron deficiency of navel orange orchard soil was serious on the whole with proportion reaching upto 87.1%.It was found that there were differences among districts.The status of soil available boron in Longnan County is best (boron content of 0.26 mg/kg),while the severe district is Zhanggong (boron content of only 0.09 mg/kg).Distribution map of soil available boron clearly revealed that boron deficiency is the main limited factor for the regional development.The application of modern mathematical methods can quickly and intuitively reflect the situation of agricultural resources.