Abstract: The rigidization technology is a key technology of space inflatable structures.The concept of Rigidization-On-Command（ROC） is proposed by the researchers of Adherent Technologies,Inc.for the first time and a cured demonstration tube is made at ILC Dover.This technology has many advantages compared to the approaches to rigidization in the past.It provided a controlled,clean rigidization technology to harden inflatable structure.The curing technologies of space inflatable structures,Rigidization-On-Command technology,the materials of ROC and the UV cured composite materials are introduced briefly in this paper.The ROC technology can provide a badly needed technology for the space inflatable structures.It can offer high reliability,good dynamic charateristics and can provide a much needed technology for the inflatable community.