We perform a complete calculation for the dilepton production from the processes qq^-→ll^-, Compton-like (qg→qll^-, q^-g→q^-ll^-),qq^-→gll^-, gluon fusion gg^-→cc^-, annihilation qq^-→cc^- as well as multiple scattering of quarks in a chemically equilibrating quark--gluon plasma system at finite baryon density. It is found that quark-antiquark annihilation, Compton-like, gluon fusion and multiple scattering of quarks give important contribution. Moreover, the increase of the quark phase life-time with increasing initial quark chemical potential makes the dilepton yield as an increasing function of the initial quark chemical potential.