Inclusive antibaryon and baryon spectra in pp collision are analyzedin a model based on three assumptions; (i) urbaryon diagram for theMueller amplitude, (ii) the whole-region formula for one-particledistribution function and (iii) urbaryon counting. Antibaryon spectraare characterized by the central production mechanism which arecharacterized by the P otimes P-type urbaryon diagram. On the otherhand, baryon spectra have four fragmentation mechanisms which arecharactarized by H otimes P-, P otimes H-, H_d otimes P- andP otimes H_d-type urbaryon diagram in addition to the centralproduction mechanism. p_T and x dependence as well as energydependence of inclusive antibaryon and baryon spectra are wellexplained by our model. The production ratio of antibaryons to baryons is investigated.