Dynamics of the changing numbers of imported red fire ant (Solenopsis invicta Buren) nests and worker ants attracted together was monitored from April 29, 2017 to February 19, 2019 in Xichang, and their nuptial flight was observed for 21 times in 2017 and 2018. Then the regularity of the dynamics of S. invicta population was analyzed in combination with the meteorological information. The results indicated that the climate in Anning Valley, Xichang was generally suitable for the survival of imported red fire ant, and March to mid-May was the key period for control. In addition, control of S. invicta is feasible during March to December while weather is appropriate. There is a significant correlation between the number of worker ants attracted together and the ten-day average temperature within a certain range, the monthly average temperature and the ten-day precipitation within a certain range. Based on these, we can choose suitable weather and use poison bait to improve the control effect.