The current study aimed to examine the effects of training sessions on children's levels of optimism versus pessimism among the kindergarten children in the district of Shobak in Jordan. The sample of the study consisted 21 children whom their ages were between 5 to 6 years old. A training program was applied. The level of optimism and pessimism among the kindergarten children were measured through the use of notes cards consisted from 12 items. The results of the study showed that there were significant differences in the level of optimism versus pessimism based among participants' before and after applying the program in favor of the post-measure.