The purpose of this thesis is to discuss the religious thoughts of Mo Tzu. His religious thoughts are primarily revealed in two chapters, “the will of heaven” and “explaining ghosts”. The tenors of both chapters are the interpretations about “God”, “ghosts”, and “God’s willingness”--“universal love and mutual benefit”, which is so-called “universal love”. Mo Tzu lived in the troubled times of the Warring State, in which many human beings, because of the wars, were destitute and homeless. The reason deep inside this turmoil is because people did not love one another. Therefore, Mo Tzu hopes that everyone should follow “God’s willingness”, since “God” claimed “universal love and mutual benefit” and punished the people who harm others with injustice. Mo Tzu proposes that people could love one another and make the society a peaceful and harmonious wonderland only through believing in “God and ghosts”. There are six chapters in this thesis. The first chapter is the introduction explaining the motivation, purpose, and methodology of the whole thesis. From chapter two to six, the discussions are about the context and major content of the Mo Tzu’s religious thoughts, interpretations and critics of modern scholars, comparisons to other famous theories and religions worldwide, and the contemporary value and significance in Mo Tzu.