We propose in this paper a seheme ealled Jet Charge Gross Section Method. In this method, the results of ealculations in pertubative QCD a.re not only less affected by the sea quark and gluon distribution functions in hadrons, just like in the calculations of cross section difference of hadrons: dσ(AB→h+X)-dσ(AB→h-X), but also independent of any fragmentation functions of partons. Furthermore, it is possible to measure the mean electric charges of various quark jets indirectly without distinguishing the quark flavors.