According to statistics of the Chinese periodical website CNKI, there are about 40 master and doctoral theses on The Grapes of Wrath. Among them, 12 these study the book from the angle of ecology. For instance, Gao Yi’s An Eco-critical Reading of “The Grapes of Wrath” studies the book from natural ecology, social ecology and spiritual ecology (Gao Yi, 2009:20). Another master thesis is On the Ecological Crises in “The Grapes of Wrath” written by Mei Fang. She analyzes the ecological crises, attempts to find solutions to these crises, including rebuilding harmony, mutual help and cooperation and establishing universal love. She also embodies the theoretical and realistic significance of Steinbeck’s ecological thoughts by discussing both natural and spiritual ecological crises (Mei Fang, 2013:47). They explore the book in light of eco-criticism and come to the conclusion that the balance between man and nature is important for the development of a harmonious world.