Abstract: In the new power system, energy consumption patterns are gradually diversified, and the characteristics of electricity consumption behaviors of users are more diverse and complex, which increases the difficulty of accurate load forecasting in the power system. This paper focuses on the flexible load resources on the diverse user side in the new power system environment, summarizes and analyzes the electricity consumption characteristic modeling technique and load forecasting technique of electricity consumption for diverse users. Firstly, the electricity consumption characteristic modeling technique for diverse users is analyzed from four aspects: diverse data collection and pre-processing, extraction of power consumption features, classification of user groups, and analysis of correlation factors, and the present situation of technical development and existing problems are summarized. Secondly, the development trend of load forecasting of electricity consumption considering demand response is analyzed, and the load forecasting techniques of electricity consumption are analyzed from two aspects: load-adjustable resources and source-load resources on the diverse user side, and the research ideas of various types of load forecasting of electricity consumption are summarized. Finally, the challenges faced by the research on electricity consumption characteristic modeling technique and load forecasting of electricity consumption for diverse users in the new power system are discussed, and reference suggestions and prospects are given considering the characteristics of the new power system and artificial intelligence methods.