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The structural phase transformation and electronic properties of Cu6Sn5 with and without Zn addition are analyzed based on the first principles calculations.The results indicate that the energy difference between the η phase and the η phase decreases significantly after Zn addition at finite temperature.This implies that the high temperature η-phase Cu6 (Sn,Zn)5 will be stabilized.Moreover,the bulk modulus is also improved after Zn addition.We attribute the corresponding structural stabilization to the relatively strong Zn Cu and Zn-Sn bonding in the η-Cu6 (Sn,Zn)5.