the controlled crystallization and characterization of Li2O-Al2O3-SiO2-P2O5 glass ceramic by XRD and numerical calculus. The results indicate that the controlled model of crystallization is the process though controlling the growing size of crystallization grain by forming residual glass phase with high melting point, and proper high-melting supplement such as Y2O3、Al2O3 can reduce crystal grain size at the same time that does not change nucleation quantity. At last, transparent glass-ceramic with little crystal grain can be obtained by the theorizing analytic model.