自蘇軾（1037—1101）紹聖元年（1094）閏四月南貶至建中靖國元年（1101）七月這一段時間可被視爲惠儋時期。在這一時期，蘇軾幾無公書，卻在尺牘中書寫政事關懷，創作了約６５封參政尺牘。蘇軾利用尺牘討論政事、抒發政見，究竟是寫作習慣還是刻意爲之，是自主選擇還是不得已而爲之？在用於書寫日常生活、溝通情感的尺牘之中，蘇軾花費了大量篇幅談論政事並且促成當地政務的解决，使用了公書寫作中的條狀寫法，並採用策論或奏狀寫作的邏輯。涉及參政的尺牘大多數寫于蘇軾謫居惠州之時，這源於廣惠地區的部分地方官員如程之才、王古等人與之關係密切。然而，自再度被貶至儋州後，蘇軾鮮少談及政事。蘇軾在惠儋時期並無差遣，他不僅不得簽書公事，而且動輒受人彈劾與監視，但仍舊留下了大量的參政尺牘。其參政尺牘一方面體現了公書寫作對私書寫作的影響，另一方面也是蘇軾面對處境刻意爲之的選擇。

Su Shi’s (1037 1101) was banished southward to Huizhou and Danzhou from 1094 (the first year of the ShaoSheng era) to July of 1101 (the first year of the Jianzhong jingguo era) when he was summoned back north, which has been known as his Hui-Dan period. Su Shi’s canzheng chidu (personal letters that discuss politics) written during this period became examples of Northern Song dynasty literati getting involved in political affairs through personal correspondence. This article tries to answer the question: Was Su Shi’s canzheng chidu merely his writing habit or a deliberate move?Su Shi wrote approximately sixty-five canzheng chidu during his Hui-Dan period, commenting on political matters, recommending talents for official appointments, and participating in political affairs. He wrote most of his canzheng chidu in Huizhou and less frequently in Danzhou because of the changes in his life. Although his insignificant posts rarely required writing official documents, Su Shi’s canzheng chidu show the format and habit of official writing, illustrating the latter’s influence on the former and the writer’s deliberate choice when confronting the circumstances of his life.