Laudato Si?is a encyclical letter of Pope Francis, which is comprised of six chapters. Subtitled as “On Care for Our Common Home? the document establishes the ecclesiastical perspective regarding the ecological crisis of humankind, and seeks Christian solutions for that. The document`s early chapters deal with existing ecological or ecotheological researches, approaching to the deep dimension of the ecological problematics on the theological basis. This paper`s interest is the chapter 2 “The gospel of creation”among them. “The gospel of creation?provides biblical insights into ecological problematics, reinterpreting Old and New Testament. While the existing understanding of creation stories in Old Testament is the hierarchical relationship of God-Humankind-World, Laudato Si` reads the universal communion among God, Humankind and ecosystem between the lines of biblical texts. Reinterpreting New Testament, the document affirms that the salvation of Jesus Christ is toward not only humankind but every creation. And in the same sense the Good News is proclaimed to every creation. From the eschatological perspective, all creatures will reconcile through Christ, and the fullness of God`s presence will take place in all creation. Such innovative interpretations and reinterpretations of Laudato Si` teaches the raison d`etre of the Catholic Church in an era of ecological crisis. And the ecotheology established on Laudato Si` calls first of all for “ecological conversion”of the church`s belief, theology and praxis.