Abstract: 【Objective】 To clarify the population dynamics and spatial distribution pattern of Frankliniella intonsa in cotton fields. 【Methods】 The five-point sampling method was used for field sampling and generalized linear mixed models were used to analyze the population dynamics of F. intonsa on leaves, flowers, and bolls of cotton; And five aggregation indexes and Taylor Power Law were applied to analyze the spatial distribution pattern of F. intonsa in cotton fields. 【Results】 F. intonsa populations in cotton fields gradually increased from mid-June to mid-July, peaked from late July to mid-August, and then gradually declined until they disappeared from late August to early September. Population levels of F. intonsa differed significantly among different organs and fluctuated with sampling date. The temporal variation of F. intonsa populations were significantly different among different organs. Flowers had the highest population level of F. intonsa during the initial growth period, peak outbreak period, decline period, and full period. The spatial distribution of F. intonsa in cotton fields was aggregated distribution and the aggregation was density-dependent. 【Conclusion】 Late July to mid-August is the outbreak of F. intonsa populations in cotton fields, and its distribution type in cotton fields is aggregated distribution, and the populations are mainly aggregated in flowers.