Abstract: Fly ash is a waste powder material for thermal power plants. Carbon black is the main reinforcing filler used in rubber products,which is derived from petroleum and coal related industries. But from the perspective of energy conservation and environmental protection,the production of carbon black must be reduced. Due to the similar properties of fly ash and carbon black,fly ash can be used as a substitute for part of carbon black in rubber reinforcements. In this paper,the research progress of fly ash filled rubber reinforcing materials was discussed,including direct filling,physical separation,chemical extraction and surfactant modification. At the same time,the industrial application of fly ash in rubber filling materials was pointed out. In addition,the method of extracting reinforcing materials from fly ash for rubber,the treatment method of filling rubber,and the research direction of industrialization were prospected. The results show that the direct filling of fly ash will result in poor dispersion and less dosage. Although the chemical purification can improve the product quality,the purification process is complicated. The ultra-fined particles obtained by the physical modification method have the problem of dispersion.The wet modification method in the mechanical chemical modification method is more effective,but the production efficiency is low. And it needs to be used after drying,which makes it difficult to achieve industrialization. At present,the industrial applications of fly ash filled in rubber materials mainly include pressure rubber tubes,flame retardant rubbers,chlorinated polyethylene hoses,etc.,and there are some limitations in the application range. In order to realize the large-scale application of fly ash in rubber products,it is necessary to solve the above application problems and combine various modification methods to improve the modification effect and efficiency. For example,when combined with physical modification method,ball milling,ultrasonic time and the energy consumption should be reduced. When combined with chemical modification,a low-cost coupling agent can be introduced to enhance the modification effect and efficiency to find a low-cost,high value-added modified fly ash method.