Abstract: A new anti-mosquito finishing agent has been successfully prepared.Due to its active group and hydrophobic cavity,nonochlorotriazinyl--βcyclodextrin(ab.MCT--βCD) was used to embed DEET which is an anti-mosquito agent.DEET-embedded MCT--βCD was proved by means of ultraviolet-visible detector and the prime technique for preparing DEET-embedded MCT--βCD as an anti-mosquito finishing agent was determined as follows: temperature was 50℃,time was 2 h,stirring velocity was 300 r/min,and the ratio of DEET to MCT--βCD was 2∶1.DEET-embedded MCT--βCD have excellent heat-resistant and alkali-resistant stability,and it can meet the requirement of actual applications.