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在80－500km范围内考虑了3种中性成份的4种离子，从严格的电子和离子密度连续方程出发，对中性风和扩散效应进行了全面、连续的考虑，由此建立了一种电离层的物理模式；在此模式的基础上针对北京地区分别对太阳活动低年（F(10.7)＝60）、高年（F_(10.7)＝300）的春（DOY＝90）、夏（DOY＝180）、秋（DOY＝270）、冬（DOY＝365）进行计算，并将所得结果与IRI－90进行了比较．结果表明：E层为典型的Chapman层：E－F谷区深度一般为0．2—0．5之间，比IRI要深；F_1缘在太阳活动低年的四季都出现，其中夏天最明显，已形成了一个F_1层，冬天最不明显，仅表现为一个轻微的凸缘，在太阳活动高年只有夏天出现了F_1凸缘，这与现有理论相符合，而IRI－90较少出现明显的F_1缘；F_2层的电子密度是活动高年比低年大，平均冬天比夏天大，这与观测结果也基本符合．
In the range of 80-500 km, four kinds of ions with three neutral components were considered. Based on the strict continuous equation of electron and ion density, the neutral wind and diffusion effects were considered comprehensively and continuously, (DOI = 90), summer (F (10.7) = 300), summer (F DOY = 180), autumn (DOY = 270) and winter (DOY = 365) were calculated and the results were compared with IRI-90. The results show that the E layer is a typical Chapman layer. The depth of the E-F valley is generally between 0.2 and 0.5, which is deeper than that of the IRI. The F_1 edge appears in all seasons with low solar activity, of which summer is the most obvious , An F_1 layer has been formed, the least obvious in winter, showing only a slight flange. Only the F_1 flange appears in summer in high solar activity, which is consistent with the existing theory while the IRI-90 appears less Obvious F_1 edge. The electron density of F_2 layer was higher in activity than in lower years, and average winter was larger than summer. This was in good agreement with the observation results.