Based on other posts by the OP, I suspect English is not his/her native language. Try to be helpful.
To @magiclife: if you're asking when people visit...it's a year round park...people visit according to their work/school schedules and Summer is the most popular/crowded due to school breaks with US holidays also being very popular/crowded. Hope that helps.
O.K..... we've planned trips at various times of the year and during different seasons. Deciding factors comes down to available funds and available time in my work schedule. Sadly there were times when I've had the funds but not the time. I try to target the less busier seasons but there have been a couple of trips when I went even though I knew I wouldnt be as happy but it was the only time available and I desperately wanted to get to WDW.
Some of the best trips happened during the weeks after Thanksgiving and before the Christmas week, mid Sept, mid May, and Oct. But the crowd levels have changed and it gets busier and busier even during the supposedly off seasons.