The distinctiveness and advancement of deep-sea battlefield space have led to progress and reforms in the deep-sea military field,and have been gradually changing the strategic pattern of military struggle. Therefore, it is imperative to accelerate the building of deep-sea battlefield environment support capabilities,so as to provide fundamental support for the safeguarding of China's national security and the expanding of overseas interests. In this paper,the deep-sea concept and the environmental impact are summarized,the situation and future challenges China are faced with are pointed out,the profound analysis on the battlefield environment support needs in scenarios such as deep-sea strategic deterrence,underwater sailing,navigating and positioning,presetting of weapons,forecast and early warning,etc. is performed,and the corresponding measures and suggestions for the building of deep-sea battlefield environment support are proposed.