Abstract: Aluminum thin film is frequently used as the layer sandwiched between two Mo layers in the metallic bridge and acts as the function of connecting ITO pattern in the capacitive touch screen.The reflectivity of Aluminum is high for the visible light.As a result,reflectivity of the capacitive touch screen with the metallic bridge is higher than that without the metallic bridge,which affects the screen display effect.In order to reduce the reflectivity of Al film,its surface roughness is increased and then the same to the diffuse reflectance.Several Al thin films with different surface roughness are deposited by changing the DC magnetron sputtering conditions,and the reasons for different surface roughness are analyzed.The technological conditions to solve the problem of metallic bridge shadow are found.