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Myzus persicae (Sulzer) , which is also called the green peach aphid, is one of the most important pests in China. It has a wide host range and its adaptation to plants differs depending on the host. The host biotypes of M. persicae have not been identified; this provides opportunities to study the host specificity of this aphid. Further research may contribute to our understanding of species diversity, which demonstrates the value of investigating the host biotype of the green peach aphid. In this study, aphids were collected from peach, tobacco, and cabbage in the dry area of the Loess Plateau, China. The preference of M. persicae for different host plants and their morphological differentiation were studied by leaf selection and traditional morphometric analysis. The results of the tropism of M. persicae toward hosts showed that the preference for the three plant hosts of aphids originally from cabbage and tobacco was not apparent in the former experiment, but it became clearer in the latter. Throughout the trial period, aphids originally feeding on peach leaves did not show a preference for any of the three plant species studied. In the presence of the three plant hosts, 63.5%, 13.8%, and 8.2% of aphids feeding on tobacco chose tobacco, cabbage, and peach leaves, respectively. This indicates that this type of aphid prefers tobacco. The aphids originally on cabbage or peach leaves had no obvious preference for their original host plants. The preference of aphids originally feeding on cabbage for the three plant hosts was cabbage leaves > tobacco leaves > peach leaves. Regarding host selection behavior of aphids from peach leaves, they were in greater abundance than those on tobacco