The research aims to identify the effectiveness of Montessori activities in teaching some life skills to children with Down syndrome through: - Constructing a life skills scale for children with Down syndrome. - To identify the effectiveness of the integration system using Montessori activities on the dimensions of the life skills scale for children with Down syndrome. Use Researcher And Curriculum experimental And that Due to its suitability to the nature of this research ,from during Designe experimental that Depends on the measurementyentribal And the farthest For two experimental groups, one of which is a combined experimental group and the other Experimental, not integrated. Society and Research sample: The research community included (40) children with Down syndrome, aged (9-12) years, in the primary stage at the (Intellectual Education) School in Sharkia Governorate.-For the academic year 2021 AD / 2022 AD, they constitute the total sample of the research, in addition to (15) normal children aged (6-9) years in the primary stage at (Abdul Latif Hassanein) School, the integration sample. (7) Down children were withdrawn to conduct the exploratory study, and (3) Down children were excluded due to their irregularity and health condition during the application of the experiment, so that the total sample of the research became (30) Down children. The researcher divided them into two experimental groups, one of which is integrated, consisting of (15) Down children, and the other is not integrated, consisting of (15) Down children.