The crystallization kinetics and mechanism of a precursor glass of lithium aluminosilicate (LAS)-based commercial low-expansion glass-ceramics were investigated using a dilatometer. The isothermal crystallization behavior of beta-quartz solid solution (ss) was found to obey the Avrami equation. Nonisothermal crystallization data were analyzed by the Ozawa method and modified Kissinger equation. The value of the Avrami exponent (n) was similar to1.5, and the apparent activation energy (E-a) was similar to500 kJ/mol, which was close to that of the diffusion of silicon and aluminum ions as well as metal-oxygen bond strengths, suggesting a three-dimensional (3D) diffusion-controlled reaction mechanism.