Abstract: Effects of temperature on the molecule distribution of a glassy cholesteric siloxane cyclic side-chain liquid crystal is investigated in this paper.The experiment results show that the highly flexible chain segment movement of siloxane backbone near or higher than the glassy transition temperature supplies enough free room for the movement of mesogens.When the specimen is cooled quickly from the temperature higher than its clearing temperature,the mesogenic subunits are only oriented;The viscous fingering structure is formed when the specimen consisting of one glassy cyclic siloxane liquid crystal and the low molecule weight chiral mesogenic subunits(p-allyloxy-cholesterol benzoate) is rolled and the viscous fingering structure can not be destroyed when the specimen is radiated at room temperature.