In the "second generation of infinite set theory" based on the new infinite theory system, the "infinite carrier theory" is the basic theory for quantitative cognitions and studies of many "mathematical things related to infinite" in infinite set. The generation and existence of the new mathematical carrier “interim-set, Non-Definite-Set 📷” determines the generation and existence of the new system of set types (Set Spectrum) --------- Empty Set 📷; Finite-Set 📷; Interim-Set (Non-Definite-Set) 📷; Infinite Set 📷, Yan Set 📷. In this newly constructed infinite related Set Spectrum: "zero quantity" is the only quantitative cognizing result of the “Empty Set 📷” since there are no elements contained in such set, which determines that people do not need or can not conduct any more quantitative cognitions and studies on the number of elements contained in such set.; many different finite sets contain different number of elements since Finite-Set 📷 since the elements contained in such sets are the “finite numbers with cognizable quantitative nature (Archimedean Property)" and people must conduct quantitative cognitions and various studies on the number of elements contained in such sets; people are bound to conduct quantitative cognitions and various studies on the number of elements contained in Interim-Set (Non-Definite-Set) 📷 since the elements contained in such sets are the “infinite law carriers with cognizable quantitative properties (Half Archimedean Property)”.