We calculate the partonic structure of constituent quark in theNext-to-Leading Order for the first time. The structure of any hadron can beobtained thereafter using a convolution method. Such a procedure is used togenerate the structure function of proton and pion in NLO. It is shown thatwhile the constituent quark structure is generated purely perturbatively andaccounts to most part of the hadronic structure, there is a few percentcontributions coming from the nonperturbative sector in the hadronic structure.This contribution plays the key role in explaining the SU(2) symmetry breakingof the nucleon sea and the observed violation of Gottfried sum rule. Theseeffects are calculated. Excellent agreement with data in a wide range of$x=[10^{-6}, 1]$ and $Q^{2}=[0.5, 5000]$ $GeV^{2}$ is reached for protonstructure function. We have also calculated Pion structure and compared it withthe existing data. Again nice agreement is achieved.
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