Abstract: In this paper, features of the total electron content and F-region of the ionosphere over the Pacific area during the typical storms are analysed on the basis of published data and some new results are presented. It is suggested that the ionospheric storm characterized by TECreaches quite distinct degree while the main phase of magnetic storm appears. The behaviour of the ionosphere, mainly the F-region, is dominated strongly by the complex relation of longitude (storm commencement), latitude, geomagnetic configuration and season (the Southern or Northern Hemisphere). It is necessary to consider the growth and decline of TECaccording to the ionization increase rate (magnetic field line retrenchment), depletion rate (loss coefficient rise) as well as transportation rate (ionization transfer between geomagnetic conpugate points and the crest-trough movement). Amore reasonable suggestion with regard to the ionospheric storm division and the phase reverse is proposed.