Abstract: Due to the asymmetry of the background ionosphere between the magnetic southern hemisphere and the northern hemisphere，the plasma instability in equatorial ionosphere can be affected.The variations of the ionospheric background parameters can be the precursors of the occurrence of the irregularity and scintillation.In this paper，the flux tube integrated method is used to study the asymmetric characteristic of the electron density and Pedersen conductivity between the two hemispheres.The results indicate that the intensities of the asymmetry of the integrated electron density N， Pedersen conductivity 〖AKΣ～5〗P and the ratio of the F-region Pedersen conductivity and the sum of E-region and F-region Pedersen conductivity 〖AKΣ～9〗FP/〖AKΣ～9〗E+FP depend on the solar activities and the seasons，and relate with the variations of the irregularities and the scintillations.It represents the distributions of the ionospheric electron density and the Pedersen conductivity may have significant effects on the occurrence of the irregularities and scintillations.Furthermore，the parameters IN and IP， representing the asymmetric intensities of the integrated electron density and Pedersen conductivity respectively，can be used as an index in ionospheric scintillation forecasting system.