Using continuous cropping as a contrast,changes of potato rhizosphere and bulk soil microflora under the different cultivation patterns were studied with plate count method.The results showed that the quantities of the bacteria and actinomyces under crop rotation and rotation interplanting were significantly more than that of the fixed interplanting with continuous cropping in the rhizosphere.The quantities of the bacteria and actinomyces in the fixed interplanting soil were more than that of the continuous cropping.There was no significant difference between crop rotation and rotation interplanting.The quantities of the fungi in continuous cropping soil were higher than that of the other processing.There was significant difference between crop rotation and rotation interplanting.The quantities of fungi in rotation interplanting soil were significantly more than that of crop rotation.The maximum number of bacteria and actinomyces in the crop rotation and rotation interplanting soil appeared on 25 d and 45 d of seedlings emergence.In fixed interplanting rhizosphere soil,the maximum number of bacteria appeared on 25 d of seedlings emergence and actinomyces appeared on 45 d of seedlings emergence.But in bulk soil,the maximum number of bacteria and actinomyces appeared on 25 d of seedlings emergence.In the continuous cropping rhizosphere soil,the quantities of bacteria and actinomyces focused on 25 d of seedlings emergence,but appeared on 45 d of seedlings emergence in the bulk soil.