2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47485I calculate the quark contributions to the axial and tensor charges and the spin structure of the proton. The result indicates that the valence current quark spins carry 1/3 of the proton spin, the total contribution of quark spins to the proton spin satisfies $ΔΣ= 1/3 + ΔΣ_{sea} \le 1/3$, and the quarks (their spin plus orbital contributions) contribute about one half of the proton spin at scale of 1 $GeV$. The valence current quark contributions to the proton tensor charge are also obtained.RevTeX file, 8 pages, no figureHigh Energy Physics - Phenomenologytext