Abstract: High performance adsorbents are one of the core components of an atmospheric radioxenon sampling and analysis system. In order to improve the detection sensitivity, it is necessary to obtain adsorbents with higher adsorption capacity for the trace xenon in the atmosphere. The dynamic adsorption properties of the trace xenon on 10 kinds of molecular sieves were investigated. The pore structure of molecular sieves was characterized by static nitrogen adsorption. The relationship between the pore structure and the dynamic adsorption properties of the molecular sieves was analyzed. The effect of flow rate of feed gas, pressure and xenon concentration on dynamic adsorption properties of molecular sieves with higher adsorption capacity was studied. The results show that the dynamic adsorption property of 5A molecular sieve is better than that of 13X molecular sieve because it has the suitable pore size. ZSM-5 molecular sieve has the highest adsorption capacity for xenon because of suitable pore size and a strong polarity in the crystal hole. The dynamic adsorption coefficient of the trace xenon on ZSM-5 molecular sieve increases linearly with the increase of adsorption pressure, and the value will tend to be stable after decrease as the flow rate increases. When the xenon concentration is between 7.6×10^-9-3.0×10^-8 mol/L, the dynamic adsorption coefficient nearly keeps constant.