The effect of the primordial transverse momentum (kr) of quark on the transverse momentum ( qr) distribution of fJ.+ f[ pair in hadronic collision is studied. The primordial kr of quark is determined by the MIT bag model. Our results say that average qr ( (qr)) of p+ p- pair in rcp scattering is about 0.2 Ge V / c larger than that in pp scattering, which is in good agreement with the data. In order to fit to the data on the qr-depcndenee of cross section and absolute value of (qr), the QCD correction is necessary, but the primordial kr of quark accounts {or the (qr) of about 0.7GeV/c in the case P+P--'>fl+fJ.-+X. Phenomenologically, the importance of the primordial transverse momentum (kr) of quarks inside the hadron is found in the transverse momentum (qr) distribu tion'' of fJ.+ ;r pair in hadronic collision, and the ratio 21 cr d cr r of deep inelastic scattering. On the other hand, the primor dial kr of quark is the inevitable results of confinement of quark, and it is deter mined by the wave function of quarks inside the hadron. In this article, we study the effect of the primordial kr of quark on the qr distribution of !J.+ ;r pair in hadronic collisions. In a previous article, 31 we have studied the deep inelastic ep scattering in a bag model, 41 -GJ and have obtained the kr dependent structure function fb (x, kr) as