Resistive flexible sensors are widely used in many fields. Especially now, resistive flexible sensors are making great contributions to the development of wearable sensors and artificial intelligence. Therefore, the current situation in this article studies the resistive flexible sensor. This article will first introduce the background of the research, and then elaborate on sensing mechanism, the sensing improvement strategy, materials of dielectric composite, and had a great discussion in detail. The research significance of this article is to provide ideas and some summaries of the current situation for future research accuracy. Therefore, the research in this paper will be of great value to the application and research of wearable and more accurate treatment and diagnosis of future patients with the help of resistive flexible sensors. It is worth mentioning that the working principle and The sensitivity improvement strategy of this kind of sensor are introduced in detail in the following paper, and the physical and chemical properties of the raw materials of the flexible sensor are well analyzed, and then in-depth discussion is carried out. It provides some feasible ideas for improving performance.