Abstract: 【Objective】 That have invaded at present, the information on the population dynamics of Ap is limited, and there are no research reports on the regularity of the population dynamics of As population. Therefore, it is urgent for us to compare and clarify the dynamics and differences of growth and decline between two different populations of Aleyrodes, in order to provide a basis for further revealing the relationship between the two populations. 【Methods】 In 2022-2023, we selected B. oleracea convar. capitata L., Brassica chinensis var. chinensis and Lactuca sativa var. longifolia Lam, which mainly grew in this area, and the invasive Asteraceae weed L. serriola L as test plants under outdoor conditions for two consecutive years, the host selectivity of the Aleyrodes proletella L. and Aleyrodes sp. was explored and the population growth dynamics of the two whiteflies comparatively on different host plants were analyzed. 【Results】 The results showed that L. serriola L. and Lactuca sativa var. longifolia Lam. were the most dominant spring and summer hosts of Aleyrodes proletella L. populations, and Lactuca sativa var. longifolia Lam.r was the primary summer and fall host; L. serriola L. was the main host of the Aleyrodes sp. population in spring, summer and autumn. Both hosts were highly favorable for feeding, survival, and development of the two population of Aleyrodes., which could lead to high population densities of two population of Aleyrodes. B. oleracea convar. capitata L. was the primary overwintering host for two whitefly populations. Field investigation showed that from late July to early September, the maximum damage period of mixed population on L. serriola L.was observed, and the total density of eggs, nymphs, pseudopupa and adults was 40.7 head (grain) /cm². In early August, the density of nymphs and pseudopupa of mixed population reached the highest in Lactuca sativa var. longifolia Lam., which was 0.7 head /cm². On the host L. serriola L., the population density of Aleyrodes proletella L. reached the highest level in late June, which was 0.54 head /cm². After that, the population density began to decrease gradually and tended to zero due to the parasiism and migration of natural enemies to other host plants such as Lactuca sativa var. longifolia Lam. The outbreak of nymphs in Aleyrodes sp. population was relatively delayed on Lactuca sativa var. longifolia Lam. 【Conclusion】 The comparative analysis of this study reveals that there were significant differences in the growth and decline dynamics of the two populations, Aleyrodes proletella L. and Aleyrodes sp., which provides a basis for further revelation of the relationship between the two populations.