In order to study the effect of discontinuous hygrothermal on properties of T700/TR1219B composite, the specimens were treated with discontinuous hygrothermal treatment. The tensile test was carried out and SEM was used to observe the lateral morphology. The nano-indentation test was conducted by peak force quantitative nano-mechanics technique (PF-QNM) of atomic force microscope (AFM) to analysis the discontinuous hygrothermal effect on properties of resin. The results show that when the rate of moisture absorption varies from 0% to 1.2%, the first time and the second time moisture absorption of T700/TR1219B composite follow the Fick law. Tensile strength and elastic modulus of specimens and hardness and elastic modulus of resin increase firstly and then decrease.