Secondly,from the angle of vertical tew and level law, inspect the history of principle of liability of foreign internet services,which extract the system of primary fault liability principle and secondary strict liability principle.

• 其次，从“垂直”单行法与“水平”单行法模式两个角度，考察了国外网络服务商归责原则的发展历史，说明以过错责任原则为主，严格责任原则为辅的双重归责原则体系是网络发展的必然结论。