Let　be　an　Artin　algebra　and　M　mod.　It　is　well-known　that　the　Bongartz＇s　Theorem　plays　an　important　role　in　the　representation　theory　of　Artin　algebras.　In　this　paper,　we　investigate　the　relative　version　of　the　Bongartz＇s　Theorem　in　the　bounded　homotopy　category　Kb(addM)　and　construct　a　Bongartz＇s　completion　for　an　addM-relative　presilting　complex　in　Kb(addM)　such　that　it　becomes　an　addM-relative　silting　complex.　Finally,　we　give　some　applications.