Abstract: To improve the added value of products prepared from fly ash,increase utilization methods,taking the fly ash in Huainan power plant as sample,treat the raw material by roasting,acid and alkali.Then analyse the original samples and treated samples using chemical analysis and X-ray diffraction（XRD）,study the main elements,mineral composition and crystal structure of fly ash,which provide reference for the comprehensive utilization of fly ash.The results show that,alkali treatment destroy the vitreous body structure of fly ash and release the active SiO2 and Al2O3.It helps to take off the impurity,release active ingredient advantage,increase the added value of fly ash.