Hot-pressed 99 % Al2O3 ceramic and sapphire were joined using Ag70.5Cu27.5Ti2 bracing filler metal at 845 to 859degreesC for 6 min in a vacuum. The interface reaction between Ag70.5Cu27.5Ti2 alloy and alumina during brazing is reported. The joining strength and the airtight of the specimen are influenced by the surface condition of alumina ceramic and the factor of welding condition.