The great party founding spirit is the great spiritual driving force for building, revitalizing and strengthening the party. To deeply understand the formation and development of the great party founding spirit, we must start from theory, history, practice and value logic, and deeply dig the dialectical unity between the fourfold logic. To be specific, from the perspective of theoretical logic, the great party founding spirit has created an ideological model of“Two Combinations”; from the perspective of historical logic, the great party founding spirit has revealed great changes unseen in a century; from the perspective of practical logic, the great party founding spirit demonstrated the great power of practice of the great rejuvenation of the Chinese nation; from the perspective of value logic, the great party founding spirit has interpreted the original mission of the party.