The article reveals main characteristics of favourable enviroment for development of creative thought in Lithuanias comprehensive school. The findings are based on the empiric reaserch data, carried out in 2011. 101 educators participated in this reaserch. Positive psychological climate and freedom of action at school have been concidered as the most important factors for the favourable enviroment to develop critical thinking of pupils. Overcrowded curriculum, low learning motivation of pupils have been pointed out as the most negative factors, that influence climate at school.