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Dendritic polymers with highly branched architectures have attracted intense research interest recently due to their multivalency,nano-sizes,three-dimensional geometry,as well as high encapsulation ability to small molecules.Combination of unique structure characteristics of dendritic polymers with stimuli-responsive properties will broaden their applications.Here,we present our recent research in developing a series of oligoethylene glycol(OEG)-based dendritic(co)polymers.They were constructed via conventional covalent chemistry,dynamic covalent chemistry or supramolecular host-guest interactions.These polymers are highly biocompatible and exhibit unique thermo-or pH responsive behaviors.Their applications as colorimetric sensors,separators and drug carriers will also be presented.Notably,thickness of these dendritic polymers provides switchable screening and protective ability to the interior units through thermally-induced phase transitions.These properties make them superior candidates for controlled transfer,release and recognition.