There were many studies that examine the effects of project approach on the children`s sociality, creativity, expression, vocabulary, problem-solving and so forth, but no empirical studies has been made that illumination the effects of project approach on the children`s script knowledge. This study aims to examine the effects of project approach on the script knowledge of kindergarteners. The subjects were 20 children sampled randomly from 2 kindergartens in C city, 10 children were assigned to experimental group receiving program in project approach and the other 10 were assigned to control group receiving no particular program. The experimental design was pre-post control-experimental design. The experiment was conducted for 6 weeks in April and May 2003. To test the effects of project approach, questions about dressing, eating, shopping, going to birth party and going to hospital were used. These questions are supposed to represent script knowledge. The data were analyzed by SPSS/win. The conclusion obtained from the results were as follows. First, the project approach was effective in improving script knowledge about dressing. Second, the project approach was effective in improving script knowledge about eating. Third, the project approach was effective in improving script knowledge about shopping. Fourth, the project approach was effective in improving script knowledge about going to birth party. Fifth, the project approach was effective in improving script knowledge about going to hospital. Overall, project approach was effective in improving the script knowledge.