SU Shi was the most important Ci-Fu writer in the later phrase of North Song.Both his general idea of Ci-Fu creation and cultivation of Ci-Fu skills had a profound influence on the following Ci-Fu writers.SU Shi's Ci-Fu creation was never broken off in every phrase of his life. In general, his ideas and writings about Ci-Fu embodied some traits as follows: Firstly, attaching importance to the relation between Ci-Fu creation and cultivation of literature. Secondly,having a general idea turning various styles into one. Thirdly, putting profundity into wateriness so as to achieve abundant meaning.Fourthly,wording in pursuit of fluency and nature.SU Shi's Ci-Fu ideas and creation that were considered as the mainstream of the Ci-Fu group in the later phrase of North Song had an evident impact on other writers.