The selection of the flux and the design of the proper process are the key factors for the growth of Yb：KY(WO4)2 laser crystal. Yb：KY(WO4)2 crystal is grown by top seeded solvent growth (TSSG) method using K2W2O7 as a suitable flux. On the basis of TG-DTA, which has two obvious absorption peaks at 1045℃ and 1010℃, the Yb：KY(WO4)2 crystal's melting point is 1045℃, phase transition point from tetragonal system to monoclinic system is at 1040℃. Analyzing the X-ray diffraction spectrum of Yb：KY(WO4)2 crystal powder sample, we can conclude that the β-Yb：KY(WO4)2 crystal is of monoclinic system, and C2/c space group. The Yb：KY(WO4)2 crystals structure forms from the WO6 octahedra joined by WOOW double oxygen bridges and WOW single bridges. The IR and Raman spectra showed, the atom group WO6 has flex vibrations at 931cm-1，925cm-1, 891cm-1 and 840cm-1, and bend vibrations at 395cm-1，369cm-1，346cm-1 and 312cm-1, the WOOW double oxygen bridge has vibrations at 901cm-1, 759cm-1, 686cm-1, 435cm-1, 496cm-1 and 298cm-1, and the WOW single bridges has vibrations at 809cm-1, 525cm-1 and 235cm-1. At room temperature, the absorption peaks are at 940nm and 980nm the emission peaks are at 989nm—1030nm.