Beijing Univ, Dept Phys, Beijing 100871, Peoples R China
; CCAST, World Lab, Beijing 100080, Peoples R China
; Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China
; Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile
; Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
The quark flavor and spin distributions in octet baryons are calculated both in the SU(6) quark spectator diquark model and in a perturbative QCD (pQCD) based model. It is shown that the ii has the most significant difference in flavor structure at large x between the two models, though the flavor and spin structure of other baryons can also provide tests of different models. The Drell-Yan process for Sigma(+/-) beams on isoscalar targets can be used to test different predictions concerning the valence quark flavor structure of the Sigma(+/-). (C) 2000 Elsevier Science B.V. All rights reserved.