Multiplicities of hadrons produced in μp scattering are analyzed with a diquark scattering model. it is assumed that a proton is composed of a quark and a scaler diquark and that both the quark and the diquark act as partons. A reasonable agreement between the experimental data and the predictions of the model is obtained. In particular, the observed large ratio of the proton to the overall positive hadron yield forx>0.2 is successfully reproduced.