Situation awareness of smart distribution network (SASDN) is the basis of stable operation and precise scheduling. Distribution network has a broad application prospect. However, SASDN is faced with a series of time-delay uncertainties caused by communication delay, scientific calculation time, and different sub-station system response time, which cannot meet the requirements of accurate scheduling of intelligent distribution network and limits its application scope. For this reason, the time-delay uncertainty of intelligent distribution network situation awareness is analyzed and expounded from the technical level. Firstly, the research status of this problem at home and abroad is introduced. Secondly, the mechanism and influence of time-delay uncertainty of situation awareness in intelligent distribution network are analyzed . Finally, the general framework of the study on the time-delay uncertainty of situation awareness in smart distribution network is constructed to provide reference for the future research.