Under the background of “double carbon”, demand response enabled load (DREL), as a flexible power asset, is gradually actively involved in power grid dispatching. It usually arranges the power consumption according to the time-of-use (TOU) in respond to the calls to create new economic growth points. The energy distribution of DREL is different from the traditional load that is insensitive to price, and as its penetration increases, this difference may bring new challenges to distribution system state estimation (DSSE). Therefore, the historical profile of traditional load cannot accurately describe the DREL behavior, which affects DSSE results and other DSSErelated operations. To solve this problem, an online pseudo-measurement generation algorithm of DSSE based on DREL is presented, and an optimization model for DREL self-adjusting behavior is established, and the uncertainty of DREL is considered. Finally, the effectiveness of the proposed algorithm is verified by IEEE 123 bus test system.