The intermediary effect of writing a paper is not obvious. During the period of 1925 ~ 1930, C.K.Ingold put forward the theory of intermediary effect, which was used to explain the chemical behavior of some molecules that could not be satisfactorily described by classical structural formulas. Under normal circumstances, there is electron transfer in molecules with unsaturated systems, and the effect produced by this electron transfer is called intermediary effect, so the intermediary effect is not obvious in this paper.