Abstract: Several kinds of mechanized harvesting model for water chestnut in cohesive soil were explored combining field investigation and field test.Problems of each model were analyzed.Effective solution was explored.Lack of water chestnut harves using other harvesting machinery was analyzed by experiment and improvement scheme was put forward.Changing agronomic methods and effective combination of agricultural machinery，and research and development ideas of water chestnut special harvester by hierarchical mining were put forward according to growth characteristics of water chestnut.It laid foundation for promotion of mechanized harvest of water chestnut.