By means of the polymer statistical theory, the sol-gel partition and the gelation condition of A f-B g type nonlinear free radical alternating copolymerization reaction are given. These results provide the basis of calculating the average statistical parameters of the copolymer network. 利用高分子反应统计理论,得到了非线性Af-Bg型自由基交替共聚反应的溶胶分数,溶胶-凝胶分配方程和反应体系的凝胶化条件,这些结果是进一步研究与凝胶网络性能相关的网络结构参数的基础。