唐代两川第一次分治时间有至德二载、上元二年二说,前人多赞成至德二载说。但从至德二载至乾元二年间益州长史或成都尹所带节度使衔来看,均为剑南节度使,推知剑南政区不曾发生变动。上元年间成都尹的节度使衔,史料记载有分歧,表明这时的剑南道政区已发生了变化。在上元二年前亦无人出任东川节度使和使府僚佐,据此东川第一次分治时间应当在上元二年。两川分治后不久即爆发梓州刺史段子璋叛乱,从叛乱中的一些迹象来看,当时的东川治所在绵州而非梓州。上元二年当年,东川治所即由绵州迁往梓州,绵州作为治所因为时短暂而被后人忽略。 For the first time in the Tang Dynasty, the division of time in two rivers in China reached two years. However, from the two sets of the highest morality to the second year of Yuan Dynasty, the governor of Yizhou Prefecture or the chief justice of Chengdu, all of whom were Jiannan Jiedushi, deduced that there was no change in Jiannan Administrative Region. The first year of Chengdu Yindu Jiedushi rank, historical records of differences, indicating that at this time of Jiannan Road has changed. In the first year, two years ago, no one was appointed as Dongchuan Jiedushi and a government official. Therefore, the first division of Dongchuan should take place in the first year for two years. Shortly after the division of Zhili Prefecture, the Zizizhou governor broke the Zizhang Duanzhang rebellion. According to some signs in the insurgency, Dongchuanzhi was in Mianzhou instead of Zi State. In the second year of the first year of the Yuan Dynasty, Dongchuan Administration was relocated from Mianzhou to Zi State. Mianzhou was ruled by the posterity for a short while.