Does anyone know how the seasons changes in Equestria?

You seriously don't know?

2788192 I meant seasons!

Watch winter wrap up episode, that will give you the answer you are looking for.

2788227 I know Winter Wrap Up, but I meant the Summer, Fall and Winter. How did they come?

Actually, this is a good question as it connects directly to the Great Chronology Screw-Up. The events of the first 3 TV show seasons, if we go by the weather seasons depicted, must be taking place over 3-5 years (depending on how many episodes you rearrange in terms of order). But the show claims that they took place over a single year, and that Season 4 Episode 1 is the first Summer Sun Celebration since the Longest Night. This is impossible.

Well i think its the same, only the preparations are different for every season.