Abstract: The national energy conservation , emnission reduction and carbon emissions policy guidance are an-alyzed in response to the current glokal environmental deterioxation;the 48 V mnild hybrid power system andoontrol strategy of 48 V heavy vehicle are comprehensively analyzed.'This paper introduces and expounds thehigh-efficiency hybid mechanism of hrybid system , including vehicle high-efficiency hybid mechanism analy-sis and 48 V power energy management strategy.'lhe application and trends of this system wouk be expoun-ded in this paper in the main engine plant. Finally , froan the perspective of national overall plan for energyconservation and emission reduction，this paper aumnarizes and puts forward the prospect.

Key words: ４８Ｖｍｉｌｄｈｙｂｒｉｄｓｙｓｔｅｍ, ｈｅａｖｙｖｅｈｉｃｌｅ, ｃｏｎｔｒｏｌｓｔｒａｔｅｇｙ