In the new era,all walks of life have higher and higher requirements for the quality of building facilities,and the traditional cement concrete materials have been unable to meet the quality needs of construction projects,adding other materials in the production of traditional cement concrete materials can effectively improve the quality of cement concrete materials,fly ash is a commonly used material in the production of cement concrete,and adding fly ash to cement concrete can effectively improve the performance and strength of cement concrete.In view of the application effect and performance of fly ash after adding to cement concrete,this paper explores the effect of fly ash on the performance of cement concrete through comparative experiments,and clarifies and elaborates the experimental process.