The shale adsorption gas and coalbed adsorption gas are important unconventional natural gas resources. The evaluation of such resources depends on the calculation of the isothermal cumulative adsorption capacity and the determination of the isothermal saturated adsorption capacity under different pressures. The isothermal cumulative adsorption capacity under different pressures needs to be obtained by the relevant calculation methods based on the test data from the adsorption apparatus. Based on the uncertainty of Adamson’s equation of solid-phase adsorption capacity presented in 1976，Donohue and Aranovich cited Adamson’s adsorption equation，and proposed the excess and absolute adsorption capacities and their relational expression that were incorrect in 1998. The excess and absolute adsorption capacities and their relation? al expression proposed by Donohue and Aranovich are cited and confirmed in the paper published by ZHOU Li et al. in 2000，which were also incorrect. From 2015 to 2018，YU Lingjie and other relevant experts followed the relational expression of the excess adsorption capacity and absolute adsorption capacity proposed by ZHOU Li et al. and published many papers in some key Chinese journals. Through the tracking research and comparative analysis in this paper，it is concluded that the excess adsorption capacity and absolute adsorption capacity are two pseudo-words lack of physical definition and use value，and the relational expression of the two is also incorrect. Using the relational expression of the excess adsorption capacity and absolute adsorption capacity，the isothermal adsorption capacity，the isothermal cumulative adsorption capacity，and the isothermal saturated adsorption capacity cannot be obtained at all.