This study focused on the benefit from the research results of Hiroshima University Kindergarten. We revised the outdoor activity database made by Hiroshima University Kindergarten (2013) which contained the information about children's play; when, how, and by what they play in outdoor environment of the kindergarten. We had 26 practitioners of early childhood education use the database on the Microsoft Excel, and answer the questionnaire which asked them about their opinions of the database. Some of the practitioners thought the database as useful for finding information about children’s play in outdoor environment. But others thought that the ideal medium to share the knowledge about early childhood education with other practitioners was not the documents about children’s outdoor activity but conversation with other practitioners and experience that they play for themselves. We concluded that the database is useful for reinforcing the knowledge.