Abstract: Ethical issues of human life situation in Marx's ecological community thought clarify the inherent nature of human existence, the ideal state of human life situation, the necessary mode of humanity-nature relationship that supports such ideal siduantion, the actual state of humanity-nature relationship and its fundamental impact on human life situation in a certain type of community, and the ideal community that achieves systemic reconciliation between humanity and nature and the consequent universal optimization of human life situation. Regarding the above ethical issues of human life situation, Marx's ecological community thought analyzes the actual state of humanity-nature relationship and its fundamental impact on human life situation in a certain type of community, exposes the alienation of humanity-nature relationship in capitalist community and the resulting human life predicaments, and envisions the systemic reconciliation between humanity and nature in a genuine community and the universal optimization of human life situation based on it. From this, it can be seen that respecting the inherent nature of human existence, resolving the alienation of humanity-nature relationship and the resulting human life predicaments, and promoting the systemic reconciliation between humanity and nature along with the universal optimization of human life situation, constitutes the highest "good" pursued by Marx's ecological community thought. Inspired by ethical issues of human life situation in Marx's ecological community thought, human should take the reconciliation between humanity and nature and the optimization of human life situation based on it as the fundamental value orientation. From systemic justice of "the relationship between humanity and nature" and "human life situation", transcending institutional differences and interest barriers, we should jointly build a community of life for man and nature and a community with a shared future for mankind which includes an ecological dimension. Together, we will promote the modernization and globalization of harmonious coexistence between humanity and nature, and construct a new type of civilization featuring harmonious coexistence between humanity and nature.