[Wu Hong-Tu] Capital Normal Univ, Dept Math, Beijing 100048, Peoples R China
; [Huang Chao-Guang] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
; [Guo Han-Ying] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
By means of the Dirac procedure, we re-examine Yang's quantized space-time model, its relation to Snyder's model, the dS special relativity and their UV-IR duality. Starting from a dimensionless dS(5)-space in a (5+1)dimensional Mink-space a complete Yang model at both classical and quantum level can be presented and there really exists Snyder's model, the dS special relativity and the duality.