“文章合为时而著,歌诗合为事而作”是白居易在元和十年(公元815年)写给其挚友元稹的《与元九书》中提出的著名的现实主义诗歌创作原则,他的文章大都也是按照这种创作原则来写的。制科考是以议论当代政事为主的一种考试,因此在每篇《策林》中,都可以看到白居易对当朝政治与经济、军事、思想与文化的一些观点与建议。 “The article is from time to time, poetry and things for the sake of ” is Bai Juyi in the Yuan Dynasty and ten years (815 AD) wrote to its best friend Yuanyuan “Yuan nine” proposed in the famous realism poetry Writing principle, most of his articles are written in accordance with this principle of creation. The system test is an examination based on the discussion of contemporary politics. Therefore, in each of the “Tailin” books, we can see some views and suggestions made by Bai on the current political, economic, military, ideological and cultural trends.