Abstract: In response to high humidity inside greenhouse, a regenerative dehumidifier was used to conduct dehumidification tests in greenhouse．Experiment was mainly divided into three parts: the first part was to lay dehumidification pipelines according to internal environment of greenhouse; the second part was to install temperature and humidity sensors inside greenhouse; the third part was to conduct a dehumidification test using a dehumidifier．Results showed that from 10: 00 to 16: 00, humidity inside greenhouse decreased from about 85% to below 60%, and humidity retention effect was better than that without ventilation and dehumidification facilities in greenhouse．