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Spatial representation is one of the core abilities of spatial cognition. The present study investigated 228 preschoolers during daily unit-block free play to investigate spatial representation use and collaboration. The findings showed children primarily use indicative/symbolic gestures for spatial positioning and object-associated gestures for spatial relations, employing functional body movements to explore and shape space. Spatial language exhibits distinct features: positional terms prefer vertical/ dynamic attributes; deictic pronouns show directionality/ functionality; shape descriptors demonstrate substitutability/ differentiation; dimensional terms display rich comparability. Gestures and language share intrinsic compatibility, increasing during trajectory expression. Co-gestures typify spatial interaction. Symbolic representation progresses through four developmental stages (behavior-dominant, co-occurrence, integration, language-dominant), manifesting juxtaposition, complementarity, reinforcement. Interpersonal synchrony activates cross-system coordination during spatial-relation objectification, enabling concretization.