Abstract: Effects of Mn and Al-Ti-B on the microstructure and properties of ZA27 alloy prepared by sand-casting technology were studied with the help of SEM and electronic universal testing machine.The results indicated that with multi-addition of Mn and Al-Ti-B,the microstructure of ZA27 alloy was improved due to the increase of hardening phases with fine sizes and uniform distribution.The tensile strength and elongation of ZA27 alloy were increased to different degrees with the addition of Mn and Al-Ti-B.Especially,when multi-addition of 0.4%Mn and 1%Al-Ti-B,the values of the tensile strength and elongation were increased by 11.41% and 49.09% reached 420 MPa and 4.89% respectively,compared with the alloy without addition of Mn and Al-Ti-B.With the multi-additions of 0.4%Mn and 1%Al-Ti-B,the wear resistance of ZA27 alloy also increased to a certain extent.