When discussing classical gardens, the unity of heaven and humanity is a crucial characteristic. Heaven represents natural style, while humanity represents humanistic features. Chinese classical garden art, as a carrier of traditional culture, has a long history and profound connotations. The design concept of "unity between heaven and humanity" permeates every aspect of classical gardens, remaining timeless and providing important reference value for modern residential environment design. This paper focuses on analyzing the "humanistic characteristics" within the "unity of heaven and humanity" in classical gardens through their artistic themes and painterly qualities, aiming to bring the philosophical contemplation of natural landscapes back into people's vision, reviving historical warmth, humanistic care, and the wisdom of landscapes.