The present study investigated the effect of happiness and sadness emotions on children decision making strategies and duration of decision making. The participants were 54 children, 5 to 6 years old, (27 boys and 27 girls) selected from Shiraz preschools. Participants, randomly, assigned in one of the groups of happiness emotion, sadness emotion and control. Animation was used for induction emotions in experimental groups. To assess the excitement of the questionnaire (X-PANAS) was used. Results showed that emotional conditions haven't significant effects on children's decision making strategies. Gender had significant effect on children's decision making strategies. Boys had higher score in decision making strategies than girls. Additionally result indicated that emotional conditions have significant effects on children's decision making duration. Decision making duration in sadness group was lower than control group. Gender hadn't significant effect on decision making duration. This study provided further insight into relationship between emotion and decision making in children.