the glass-ceramics with the principal crystalline p hase of fluorapatite was prepared with Na2O-B2O3-Si O2 as the base glass system, by selection of the different co mposition points inside and outside of the glass ph ase-separating section and addition of a certain percentage compos ition and by means of sintering process. The influe nce on the phase separation in glasses and crystallization by the different compositions and different heat treat ment temperatures and the mutual relation between the ph ase separation in glasses and crystallization were researched by XRD phase analysis and SEM analysis and other an alysis methods for the sample. The experimental res earch results indicate ：（ 1 ） the principal crystalline phase crystallized from t he test sample after heat treatment was fluorapatite Ca5(PO4)3F and a certain content of cr istobalite was generated at the same time; （ 2 ） the phase separation and crystallization effects of C composi tion recipe in the phase-separating section were mo st obvious and there was no phase separation in glasses in E compo sition recipe outside the phase-separating section at the same heat treatment temperature; （ 3 ） the composition in phase-separating section had the most obvious phase separation after treatment at 720 °C ; the excess heat treatment temperature was adverse to phase separation in glasses; the phase separation in glasses played an obvious role in promoting the glass crystallization; and an appr opriate rise in the heat treatment temperature is beneficial to the glass-ceramics crystallization.