The purpose of this study was to investigate how throwing activity among the constructivism theory-based physical knowledge activities affects the problem-solving skills and spatial ability of young children. The subjects of this study were 40 young children aged 5 (boys14, girls 26), attending in the public kindergarten located in S-city in Kyeonggii-province. Results of this study were as follows: First, throwing activity among the constructivism theory-based physical knowledge activities had a positive impact on the problem-solving skills of young children(p< .01). In terms of sub-elements, throwing activity among the constructivism theory-based physical knowledge activities had a positive impact on the problem discovery and statement(p< .01) and idea proposal and application for problem-solving(p< .05), but they had no impact on the conclusion-forming process for problem-solving. Second, throwing activity among the constructivism theory-based physical knowledge activities had a positive impact on the spatial ability of young children(p< .01). In terms of sub-elements, throwing activity among the constructivism theory-based physical knowledge activities had a positive impact on the eye-motor coordination(p< .05), spatial reasoning(p< .05), and visual memory and reminiscence(p< .01), but they had no impact on the figure-ground perception and position-in-space perception.