Preparation of BaSc2O4:Ce3+ phosphor is made by high temperature solid phase method. The prepared phosphor samples were analyzed by XRD, SEM, PL and CIE. The result shows Ce3+ doping does not change the phase structure of the BaSc2O4 matrix, and the particles have good smoothness, uniform element distribution, and have not other impurity elements. BaSc2O4:Ce3+ phosphor can be excited by ultraviolet light (439 nm) and emit green light (495 nm) with good purity. The color coordinates of BaSc2O4:Ce3+ phosphor is (0.2493, 0.5239), and the color temperature is 7414 K, and the fluorescence lifetime is 1.49 ns. By assembling this phosphor with red phosphor and blue chip, a WLED with good luminous performance can be obtained.