Y2.94Al5-2x(MgSi)xO120.06 Ce yellow-phosphors are synthesized by the high temperature solid-state method. The structure and optical properties of samples are characterized by application of powder X-ray diffraction (XRD) and photoluminescence spectroscopy. Moreover, the variation of photoluminescence (PL) and photoluminescence excitation (PLE) spectra are studied as a function of (Mg-Si) concentration as well as the energy level of outer shell electron of Ce3+. XRD analysis reveals that all of the synthesized phosphors are nearly single-phase garnet and no impurity phases are presented. Phosphors show broad yellow emission band in the range of 500～650 nm and two maximum excitation peaks are located at 340 nm and 460 nm. With the increase of (Mg-Si) concentration, the PL spectra presents distinct red-shift. In the PLE spectra, the near ultraviolet excitation band shows blue-shift and the blue excitation band shows red-shift, respectively. Simultaneously, the crystal field strength around Ce3+ is enhanced and the energy level of outer shell electron (5d1) of Ce3+ is broadened.