Based　on　Cu-Zr-Al　tenary　alloy,　the　effects　of　addition　of　Ag　and　Fe　elements　on　glass-forming　ability　and　mechanical　properties　of　Cu-Zr-Al-Ag　and　Cu-Zr-Al-Ag-Fe　bulk　amorphous　systems　were　investigated.　Cu50Zr42Al8　BMG　exhibits　high　glass-forming　ability　and　thermal　stability　in　ternary　alloy　system,　ΔTx,　Trg　and　γ　of　which　are　61　K,　0.624　and　0.416,　respectively.　The　glass-forming　ability　of　Cu-Zr-Al　ternary　alloy　system　is　obviously　improved　with　addition　of　Ag.　In　the　quaternary　system,　Trg　of　Cu43Zr45Al8Ag4,　Cu45Zr42Al8Ag5,　Cu40Zr44Al10Ag6,　Cu43Zr41Al8Ag8　and　Cu36Zr48Al8Ag8　are　0.618,　0.625,　0.618,　0.628　and　0.598,　γ　of　which　are　0.424,　0.427,　0.424,　0.432　and　0.433,　ΔTx　of　which　are　77,　76,　78,　84　and　108　K,　respectively.　In　the　(Cu0.36Zr0.48Al0.08　Ag0.08)100-xFex(x　=　0,　3,　5,　10,　15,　20)　quinary　system,　the　addition　of　Fe　exists　an　obvious　effect　on　the　glass　forming　ability　of　the　alloys.　Although　the　ΔTx　and　Trg　are　reduced,　the　(Cu0.36Zr0.48Al0.08　Ag0.08)97Fe3　bulk　amorphous　alloy　exhibits　high　glass-forming　ability,　and　ΔTx,　Trg　and　γ　of　this　alloy　are　103　K,　0.566　and　0.424,　respectively.　The　compressive　fracture　strength　and　plastic　strain　of　(Cu0.36Zr0.48-　Al0.08Ag0.08)95Fe5　alloy　increase　to　2249　MPa　and　4.9%,　respectively,　which　shows　that　the　addition　of　suitable　Fe　improves　the　mechanical　properties　obviously.　The　existence　of　Fe　element　results　in　the　distinct　phase　separation　in　Cu36Zr48Al8Ag8　alloys,　which　strengthens　and　toughens　the　(Cu0.36Zr0.48Al0.08　Ag0.08)100-xFex　alloy.