Er3+,Yb3+∶Ba3Gd(PO4)3 crystals with different atomic fractions of Er3+ and Yb3+， i.e. 1.85%Er,23.95%Yb∶Ba3Gd(PO4)3 and 1.95%Er,55.73%Yb∶Ba3Gd(PO4)3 were successfully grown by the Czochralski method. Room-temperature absorption coefficient spectra, up-conversion fluorescence spectra, emission cross-section spectra, gain cross-section spectra and fluorscence decay curves of the crystals were measured and analyzed. Emission cross-section at peak fluorescence wavelength of 1 537 nm, fluorescence lifetime of the 4I13/2 multiplet of Er3+ and Yb3+→Er3+ energy transfer efficienecy of the 1.85%Er,23.95%Yb∶Ba3Gd(PO4)3 crystal are 0.54×10-20 cm2, 9.9 ms and 90%, respectively, while the above values of the 1.95%Er,55.73%Yb∶Ba3Gd(PO4)3 crystal are 0.58×10-20 cm2, 9.7 ms and 93%, respectively. End-pumped by 975 nm laser diode, 1 567 nm continuous-wave laser with maximum output power of 97 mW and slope efficiency of 27.1% is obtained in the 1.85%Er,23.95%Yb∶Ba3Gd(PO4)3 crystal, while 1 567 nm continuous-wave laser with maximum output power of 93 mW and slope efficiency of 17.1% is obtained in the 1.95%Er,55.73%Yb∶Ba3Gd(PO4)3 crystal.