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Polymer science entails the structural study at multi-levels from nano-to micro-and mesoscale,which is highly im-portant to transfer or even amplify the molecular information to macroscopic materials.Multiple polymer structural transitions from lower-order to higher-order superstructures are normally in-volved to achieve selective,efficient and sophisticated functions.Therefore,in-situ visualization of these processes is highly important,not only for fundamental understanding the structural evolution,but also for the optimization of the process flow during the mate-rials processing.Fluorescence imaging based on aggregation-in-duced emission(AIE)provides an ideal tool that offers a simple,ac-curate,and easy-readable method to fulfill the above requirements.Owing to the twisted propeller-like structure of AIE lumino-gens(AIEgens),they show high fluorescence sensitivity to the sur-rounding microenvironment(e.g.,viscosity,rigidity,and polarity)through intramolecular motions.In this short review,we summarize the recent applications of AIEgens to serve as“built-in”sensors to analyze the process of polymerization,microphase separation,glass/vitrification transition,polymersolvation,crystallization,etc.The perspective on the future application of AIE technology in poly-mer engineering,especially fiber materials,is also discussed.