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Effect of pressure on thermal behavior of KDP crystals is investigated by using the in-situ infrared reflective spectra.Compared with that under normal atmosphere, the onset temperature of decomposition under pressure of 1 MPa is improved to from 210℃ to 213℃, suggesting that the thermal stability of KDP is enhanced.Under pressure of 2 MPa, the thermal stability is deteriorated and KDP begins to decompose at 183℃.Under normal atmosphere KDP decomposes in route of translating to K4P2O7 firstly, and then to KPO3.Under pressures of 1 MPa and 2MPa, KDP translates to KPO3 directly without any other polymeric intermediates.