In this research we are Studying the improvement of the thermal conductivity of The 6063 aluminum alloys by Alloy elements Adding such as (Boron & Titanium) . In this Study we used (6063) aluminum alloy as a base metal because it using of the fabrication of Central Processing Unit(CPU) heat sinks . First, we brought casting mold. We melted Aluminum after weighting it ,and we adding Alloy elements (Boron & Titanium), we selected the temperatures of the furnace at 1000 ℃ ,for period 60 minute.