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The non-critical phase matching (PM) conditions of deuterated dihydrogen phosphate (DKDP) crystal are investigated in this paper for fourth harmonic generation (FHG) of Nd:YAG crystal and Nd:glass lasers,which include exterior angle deviation,deuterium content and PM temperature.DKDP crystals of different deuterium content were grown from aqueous solutions and cut for type-I non-critical phase-matching with the direction at 90° to the crystal Z axis (θ = 90°) and at 45° to the crystal X axis (Ф = 45°).The samples are measured for FHG at 1064 nm and 1053 nm,respectively.The deuterium content of DKDP crystal that supports noncritical phase-matching for FHG experiments is confirmed by measuring the relationship of deuterium content and phase-matching angle.Additionally,the non-critical phase matching temperature is also examined.