Abstract: The model access system is an important part of the cryogenic wind tunnel, and it is the core system to realize low temperature model replacement. The model access system of the cryogenic wind tunnel has the characteristics of complex structure, large scale, high functional integration and high requirements for environmental conditions. By contrasting overseas the design of the model access system of the cryogenic wind tunnel and introducing the domestic current situation of related technologies, the key technologies of the design for the model access system of the cryogenic wind tunnel are discussed in this article, such as the large volume and low dew point air drying system, temperature regulating system with a wide temperature range, large-tonnage and high precision model cart, large lock door, moisture emission control in dry space, etc.. The technical difficulties and research approaches of each aforementioned key technology are expounded, respectively. Finally, some proposals are offered for the design of the model access system of the cryogenic wind tunnel.