A fluidized bed experimental device was developed according to the industrial storage condition of the fly ash(FA), and HCl(HC),H2SO4(HS), NaOH(NH), Na2SO4(NS) and NaCl(NC) which were used as the modified materials to modify FA.The results show that all the modified materials have less effect on liquidity of FA by the fluidized bed reactor vapor deposition method(FBR VD), except that HC obviously improved the liquidity. In addition, NS slightly reduces the strength of FA cement paste at different ages, other modified materials all play an enhanced role at different ages, and NC has the most significant enhancement effect before 7d with the activity index over 110%. Although the concentration of Cl- in the hardened paste dissolved in water is significantly increased by using the modifier containing Cl-, the majority of Cl- is cured by FA cement paste. The soluble Cl- content in the cement paste modified with FA does not reach the limit specified by the national standard and does not affect the safety of steel reinforcement. The modified material can be uniformly deposited on the FA surface by FBR VD method, and the scale of sedimentary particles is below 500 nm. A large amount of calcium hydroxide crystal(CH), the cement hydration product, is added to the surface of the modified FA particles in cement, and the FA spheres are overlapped with the cement stones around them. Different modified materials have different effects on the hydration reaction of FA surface, so they show different strength. The CH distributed on the FA surface with HC and NH form a slender strip, which uniformly connect FA firmly with cement stone to enhance the effect. The surface of FA particles modified by NC show dense accumulation of CH, which has the most significant enhancement effect before 7d. Although the thick CH is deposited on the surface of FA modified by NS, it is loosely bound to cement stone, resulting in a slight decrease in strength. The amount of CH adsorbed on the surface of FA modified by HS is less, and its contribution to strength is less.