Liquid crystalline blue phases(BPs)have sparked an enormous interest due to their exotic optical properties,exhibiting no birefringence but selective reflection of circularly polarized light,and potential for advanced applications in a wide variety of fields including self-assembling tunable photonic crystals and fast-response display.As is known,the main obstacles to the potential applications of the BPs are the narrow temperature range as well as the instability of cubic structure against an electric field.Therefore,there is an urgent need to explore a novel strategy to solve these shortcomings and develop the BP composites with wide temperature range,free hysteresis,fast response speed and low driving voltage.In this talk,we will report some of our recent progresses on manipulating the phase transition temperature and electro-optical properties of BPs.