[Aim] Solenopsis invicta Buren was first detected in Yuanmou County of Yunnan Province in October 2013. In this study, we aimed to describe the seasonal dynamics of the different casts.[Method] Ant nests were sampled, with individuals weighed, and the different casts counted in Yiliang County, Kunming from January to December 2015.[Result] In the ground-based nests, we found two abundance peaks of S. invicta, from August to September, and from March to April. The ratio of wingless S. invicta females was the highest from March to April. The ratio of winged S. invicta females was the highest in April, followed by July. For males, the ratio of winged individuals was the highest in May, followed by September. We found the highest ratios of S. invicta sexual larvae and pupae in March, April and December. Within nests, the peak of the soldiers, workers, sterile larva and pupa occurred from August to September, then in April.[Conclusion] In Kunming, S. invicta had two seasonal abundance peaks, the first one from August to September, when prevention and treatment should tackel sexual and sterile forms. During the second peak, from March to April, prevention and treatment should be aimed at sterile ants.