Abstract: Preliminary Searching for the Characteristics of Soil Biological of Seaisland Cotton Field in Different Irrigation Models, The result showed that the quantities of microbe of seaisland cotton field, rhizosphere and no-rhizosphere in drop irrigation is more than in furrow irrigation. Effect of rhizoshpere is evident in two drops irrigation. Soil is anaerobeic in drop irrigation ,the soil enzyme activity is increase obsolete, but drop irrigation can offer moisture and nutrient to crop quantitative with water, and maintain sensible concentration of nutrient and moisture also, gratify desideration of the cotton to water and fertilizer suitable time, quantum sufficit, timely and enhance utilization of moisture and nutrient in effect, effectiveness of the increase in yield is very well.