Objective  To establish the continuous ultra-thin anatomical specimen data set of Chinese preschoolers and its application in visualization.   Methods  The boy’s specimens, who was excluded from organic diseases and deformities by 64 row spiral CT and 3.0T MRI, was 6 years old, 1.14 m in height, 23 kg in weight, normal in development, no damage to skin and viscera, and no extrusion deformation as a whole. After three weeks of finalization, freezing, embedding and freezing in -25 ℃ cold storage, Shandong digital human company has milled and cut in -25 ℃ low temperature laboratory layer by layer in numerical control freezing without saw damage, and milled 0.10 mm from the foot to the head. The camera model was rencay16k3 Scanback, which scaned layer by layer to obtain high-definition data set images.   Results  A total of 11 421 cross-section images were collected, all of which were originally saved in PNG format. Each image was 13 000 pixels × 8000 pixels, about 27.4 MB. The total data set of preschool boys was 305.60G.   Conclusion  According to the literature search, there is currently a few complete digital visual human body data set for preschool boys from foot to head. The digital visual boy data set is successfully established in China, which is the study of children’s developmental morphology and various organs will help the exploration of virtual surgery approach, the compilation of teaching materials and monographs, as well as the prevention of children’s diseases, diagnosis and treatment, and popular science.