Abstract: Cement molding and sintering of MSW fly ash were carried out，and XＲD/SEM were applied to seek the sintering mechanism and the effect of fluxing agent． The results showed that Na2CO3 could accelerate fly ash solidification during the early phase of cement molding，but showed negative influence with the solidification time increased; With a curing time of 2 d， the compressive strength of cement solidified body reached 1. 91 MPa，completely meeting the intensity requirements of making bad body; XＲD and SEM analysis results showed that the solidified body mainly produced gehlenite and calcium silicate during sintering，and Na2B4O7·10H2O had obvious fusion effect; The leaching concentrations of Ni，Cu，Pb and Cd reduced with sintering temperature increased，and leaching concentration of Cu and Cd increased with dosage of Na2B4O7·10H2O increased，but Pb decreased． The leaching experiment results showed that the leaching content of Ni，Cu，Pb and Cd were lower than the national standard limit．