The standard of kindergarten class number stipulated by the Education Bureau is different according to the education policies of different countries and regions. In China, according to the regulations of kindergarten work, the standard of kindergarten class size is generally 25-30. This is because kindergarten education pays attention to individual differences, and smaller class size is beneficial for teachers to pay more attention to the development and needs of each child and provide personalized education services.

In addition, smaller class sizes also help to promote interaction and cooperation among children and cultivate their social skills and teamwork spirit. Teachers can better communicate and interact with each child, understand their interests, specialties and needs, and provide them with personalized education and guidance.

However, it should be noted that the standard class size of kindergartens is not an absolute fixed value, which may be adjusted due to factors such as region, kindergarten size and resources. Some special kindergartens, such as boarding kindergartens or special education kindergartens, may adjust the class size according to the actual situation.

In short, the Education Bureau stipulates that the standard number of kindergarten students in each class is generally 25-30, in order to provide better education quality and personalized service and promote the all-round development of young children.