Abstract：Lu Sidao' s Lao Sheng Lun was praised as the best works in Sui Dynasty. Because of the event of Yu Chijiong, Lu Sidao resigned his position to Wu Yang' s prefect. He wrote the works before he entered Gao Jiong' s mu-fu in the first year of Kai Huang Period in Sui dynasty. Lu Sidao circulated among the old and new countries, he put his micro-history into the national macro-history of the dynastic change by means of pretending to question and answer the host and guest. As the representative of the Bei Qi' s old gentry, he expressed the contradiction on the official and recluse after the change of a dynasty, and criticized the dirty intellectual ethos at that time.

Keyword：Lu Sidao;Lao Sheng Lun;writing time;the psychology of intellectual ethos;