Compared with conventional civil buildings, theme park projects possess characteristics of large area, numerous types of buildings, and involving a wide range of specialties, so it is necessary to introduce BIM technology to solve problems that cannot be solved through conventional 2D design methods. Taking a BIM-based large-scale rockery design as an example, this paper carries out the project deliberation and multi-professional coordination. For complex entertainment units, immersive experience is carried out from the perspective of visitors, the projection equipment routes is simulated, the civil engineering design and packaging design are optimized, and the seating arrangement is ensured to be reasonable. Fine model of archaic buildings in the entrance area is established, and BIM model is used to roam through the human perspective to assist the construction units in making design decisions. Considering the integrity of the park, this paper also analyses the municipal pipeline, the spatial relationship of the individual, the tour route of the float, and the safety of the equipment operation, so as to ensure the best visitors'feeling of the park. Through applying the BIM technology, full participation, and coordination of professional measures, and considering of aesthetic, functional and safety factors comprehensively, design problems are fully considered and properly solved, which certainly improves the quality of the effect.