Abstract: The research aims to identify how Functioning Musical Activities and Brain- Based Learning Principals on the Development of Musical Intelligence for kindergarten children Kid, in order achieve this goal ,this research identifies musical activities and some principles of the work of the brain which are suitable for achieving that goal. It also applies atest to measure the musical intelligence before and after applying the research. In addition, this research includes applying aproposed program to Functioning the musical activities with the Brain-Based learning Principals to reach the survival of its impact on developing the musical intelligence in the kindergarten children. The importance of this research is clarified by including some musical activities and Functioning them with he Brain-Based Learning Principals in the educational situations. It also helps with presenting a musical intelligence measure, and it provides aprogram designed to develop the musical intelligence through th integration musical activities with the Brain- Based Learning. This program opens the field for new research in the field of child music. The researcher used the semi-experimental approach of one experimental group which consists of about(20) children from Minya language official Kindergarten, Minya governorate, Arab Republic of Egypt.                                                                                                            It includes applying apre  musical intelligence   measure, applying the program designed, and then applying Apost musical intelligence measure, and finally  analyzing the results statistically.  The indicates astatistically significant difference between the mean scores of the experimental group children in the pretest and posttest musical intelligence scale in favor of the posttest.