Photo-controlled reversible-deactivation radical polymerization(photo-RDRP)has been investigated as a"green"and spatiotem-porally controlling pathway for polymer synthesis.While the combination of photo-RDRP and flow chemistry has offered opportunities to increase light intensity and enable uniform light irradiation,problems associated with flow approaches still remain for photoflow-RDRP,which has hindered merging flow polymerization with other cutting-edge techniques.Herein,we summarize challenges and recent achievements in photoflow-RDRP including the development of(a)droplet/slug-flow to regulate residence time distribution,(b)mixing techniques to tailor polymer,(c)polymerization induced self-assembly,and(d)computer-aided synthesis.We hope this work will provide informative knowledge to people in related fields and stimulate novel ideas to promote polymer synthesis in both academia and industry.