At a young age, there is a lot of development that needs to be developed. Because, during childhood, children are more active, enthusiastic, and often have a high level of curiosity. The aim of this research was to see children's scientific development using the experimental method with the rainbow walking water game. This research was conducted on children aged 4-5 years at RA Asy-Syuhada’ Pamekasan. One of the child developments that needs to be developed is the development of children's science. The development of science in children can also be developed from an early age. Children can get to know the experiment with the rainbow walking water game. Researchers studied children aged 4-5 years to develop children's scientific development. Children's scientific development can be done using various methods. In this research, the method used is an experimental method using the rainbow water walking game.