After　analysed　the　leakage　current　theoretically,　it　is　found　that　the　ratio　of　leakage　current　to　input　current　will　be　smaller　while　the　width　of　the　laser　ridge　increasing.　So　we　used　broad　area　laser　in　the　experiment.　Comparable　experiments　are　carried　out　based　on　the　theory,　and　it　is　observed　that　under　the　situation　of　not　adding　nonradiative　recombination,　a　smaller　distance　between　the　lateral　array　groove　and　the　laser　ridge　will　yield　the　better　result　of　reducing　leakage　current.　Therefore,　the　threshold　current　will　be　lowered,　and　the　optimal　power　efficiency　will　be　improved.