Abstract: To the unclear level of lack of nutrient limiting factor in the granite latosol of banana gardens in Hainan Island, the method of systematic study on soil nutrition is employed for studying in this paper. The results indicated that: (1) Latosol to various nutrient adsorption fixed ability size order is: B>S>Cu>K>Zn; (2)In the sorghum pot experiment, the nutrient owes lacks degree is: N>Zn>B>Mg>S>K>Mo>Ca>Cu；(3)In the banana pot experiment, the nutrient owes lacks degree is: N>Mg>Zn>K>Ca>S>Mo>B; (4)N is the first limit factor. This fully explained that the soil fertility was barren, and must strengthen the nutrient employment which the soil lacked and the banana needed, so as to enhance the soil fertility, and thus to realize banana's balanced fertilization; Simultaneously, it proved that the soil nutrient condition system methodology may be used for evaluating the soil fertility well.