TiO

2

film is formed to clad the surface of the Cu powder by hydrolyzing sol-gel process for improving the oxidation resistance of copper powders. Effects of various water

acid and sol-gel quantity on cladding effects are investigated by measuring transmissivity rate away from 760 nm of the solution under the condition of eroding the samples in 5% H

2

SO

4

solution for four hours. The results show that the transimissivity rate of the coat samples at 760 nm is more than 80% with 1 to 2 of Ti（OBu）

4

and H

2

O

0.32 mol/L of H

+

content and 4%

6

% TiO

2

sol

while that of initial samples is 15%.SEM

EDS

XPS and XRD are employed to characterize the coated samples. XPS analysis shows that the main elements in the surface of the coated copper podwders are Ti

Sn

C

O and Cu

in which Ti and Sn are in the state of Ti

+4 and Sn

+2

respectively. The XRD analysis for coated copper powder and initial samples after 60 day in air indicates that the advents of Cu

2

O in surface of the initial samples are observed

while only Cu can be observed in the coated samples.