Second harmonic generation in Er3+ and Yb3+/Er3+ doped silica fibers has been demonstrated. The maximum peak power conversion efficiencies of fibers with various Er3+ and Yb3+/Er3+ doping have been measured. The visible fluorescence spectra emitted from Er3+ ons have also been recorded before and after the doped fibers were prepared to generate efficient SHG. And the influence of Er3+ and Yb3+/ Er3+ doping on SHG in silica fibers were discussed.