The smart homes environments provide new possibilities for home game design. This paper is to explore design strategies for smart home game interactions for children in the new scenario. First, present a brief overview of the meaning of smart home and explain the importance of game as a home activity for family members. Then introduce three interactive technologies closely related to children's game design in the smart home scenario, analyze the changes brought by smart homes to children's game design. And finally propose design strategies based on relevant design cases and show a design practice. The interactive surfaces and immersive spatial experiences in smart homes provide room for expansion of children's game mechanisms and game experiences. The design of children's games in the new scenario needs to consider and make full use of the interactive surfaces in the home space, while choosing interactive space according to the action characteristics of children users, avoiding the spatial interaction barriers caused by fragmented furniture, and providing children and family members with an embodied, collaborative, and more natural home game experience.