Abstract: The digital transformation of distribution networks will further promote the deep coupling of information system and physical systems. Due to the limited information security defense resources of the distribution network, it is difficult to isolate the security risks of the information side from the physical system, which also makes the state estimation of the distribution network face new challenges. Firstly, the architecture of the distribution network cyber-physical system is briefly introduced, and the technical framework of the distribution network state estimation for cyber-physical system is constructed. Secondly, this paper comprehensively reviews the research status of distribution network state estimation technologies at home and abroad on the background of cyber-physical fusion, including the pseudo-measurement modeling and analysis of distribution networks considering cyber-attacks, the analysis and defense of false data injection attacks in the distribution network, and the security risk analysis and reliability assessment of distribution network cyber-physical systems. Finally, the key problems facing the further development of this field are discussed and analyzed.