The invention, relating to the technical field of phosphor, particularly discloses a phosphor represented by (M1-xRex)3Al5-ySiyO12-y-zNy+z, wherein M represents one or more elements of Y, Lu, Gd, and Tb, Re represents one or two elements of Eu, Ce and Pr, x is no larger than 0.1, y is no less than 0 and no larger than 1.0, and z is no less than 0 and no larger than 1.2, the initial raw materials comprise a pure oxide of M, a pure oxide of Re, nano alpha-Al2O3, a nitride and analytically pure HBO3/NH4F/LiF as a sintering aid which accounts for 1 wt% of the weight of the initial raw materials, and the nitride is nano amorphous Si3N4. Compared with the prior art, by using the nano amorphous Si3N4 to introduce the Si4+-N3-bond, the synthetic phosphor can keep high luminous efficiency and thermostability while the emission spectrum is continuously red shifted.