在唐睿宗朝政治史的研究中，最引人注目的议题便是太平公主与李隆基的政争，而睿宗在其中扮演何种角色，与其子、其妹分别保持何种关系，对双方结局又有何影响，更是引起学界探讨的焦点。本文以睿玄关系为中心，在前人研究的基础上，试图通过对几个具体问题的探讨，解释这一时期的政局演进。

睿宗朝的禁军控制。本章通过分析《钟绍京告身》，结合传世文献，认为授予和褫夺岐王、薛王兵权的命令均出自睿宗，而非隆基，其意在于掌控政变后的局面，巩固自身位置，并安定储位；通过对《葛福顺墓志》的重新释读，考证葛福顺出任羽林大将军兼万骑使时间应在先天二年七月之后，他也未曾直接参与先天政变；最后，得出在整个睿宗朝，北门禁军中的万骑极有可能一直属于李隆基的直接掌管范围的结论。

御史台、宰相视角下的隆基-太平公主政争。唐朝前期，御史台官员和宰相群体联系密切。武周以后，御史弹纠和选任的一系列改革加强了御史台与中书门下的联动性。本章以御史台制度变革、人员构成、人员背景的角度观察睿宗朝政治史，并在此过程中兼及同一时期宰相的变化。具体来说，以时间为线索，首先分析睿宗即位初期御史台的变革，这一变革的潜在原因是御史台-政事堂政治网络的形成；其次，通过考察弹劾惠范事件、废右御史台事件、刘幽求事件，理清太子、太平公主在不同时期对宰相群体、御史台官员的激烈争夺，在睿宗出手平衡双方势力失败后，此前的制衡状态全面崩溃，最终导致兵戎相见。

天文星象与睿宗朝政治。本章通过分析该时期的天文异象，分析异象发生前后的政治事件，以此解释睿宗的三次让权。首先，考察了睿宗对于天文术数的态度，认为他是一位对天象颇为敏感的道教徒；其次，分析太史令傅孝忠被杀的原因，可知睿宗朝对立势力之间有利用星象进行政治斗争的可能性；再次，检阅景云二年二月至七月发生的三次星象异变，发现在星占意义上都与兵变有关，且直指禁军在握的太子，这是睿宗这一时期多次让权于子的原因，也在侧面印证了太子早在景云二年就掌握了禁军的结论；最后，通过对李隆基即位后异象的分析，解释了玄宗本已大权在握，却不断丧失对于宰相和御史台的把控的反常现象。

结语。睿宗是唐朝前期极为看重宗族和睦的皇帝，面对子妹矛盾，他往往采取制衡的措施。这体现在睿宗朝机要官员的配置上，特别是对政事堂、御史台长官的选择上。虽然这种平衡的方式最终并没有避免双方走向极端，但通过对这一过程的梳理，可以更为清晰地认识政治斗争之外的睿宗，把握这一时期的政局走向。

In the study of the political history of the Tang Ruizong’s reign, the most striking issue is the political dispute between Taiping Princess and Li Longji, and we usually focus on what role did Ruizong play in it, what kind of relationship with his son and his sister, and what was the outcome for both parties. This article focuses on the relationship between Ruizong and Xuanzong, and based on the previous research, attempts to review the political status of this period by rethinking several specific issues,

The control of Imperial Armies in the reign of Ruizong. By analyzing the Credentials of Appointing Zhong Shaojing and historical records, this chapter proves that the orders to granted and deprived Imperial Prince Qi and Imperial Prince Xue of the military power were from Ruizong, not Li Longji, which means to matained the situation after the coup, consolidated his postion, and stabilized the Heir Apparent’s position. Then, reinterpret Ge Fushun’s Epitaph and proves the time of Ge Fushun controlling Wanqi should be after July, the second year of Xiantian, and he didn’t participate Xiantian Coup. Finally, it is very likely that Wanqi in the Beiya Imperial Army had always belonged to Li Longji's control.

Contradictions between Taiping Princess and Li Longji under the perspective of Grand Councilors and Censorate. In the early Tang, the Secretariat and the officals of Censorate were closely connected. After Wuzhou dynasty, a series of reforms of Censorate, like impeachments and appointments, strengthened the linkage between the two agencies. This chapter observe the political history of this period from the perspective of the system reforms, officialdom’s composition and officials’ background, during this process, the changes of the Grand Councilors in the same time are also included. Specifically, first, analyze the transoformation of Censorate in the early Ruizong’s period. The underlying reason for this change is the formation of the Secretariat- Censorate political network. Then, investigate three events: impeached Hui Fan, abolished the Right Censorate, event of Liu Youqiu. After that, clarify the fierce competition between Heir Apparent and Taiping Princess about the Grand Councilors and the officials of Censorate in different periods. Ruizong attempted to balance two parties but failed, the previous balances collapsed and eventually led to the coup.

Astronomical aberrations and the politics of Ruizong’s period. This chapter explains the three concessions of Ruizong by analyzing astronomical aberrations and the political events before and after these visions occurred. First, inspect Ruizong’s attitude towards astronomical astrology, that he was a Taoist who was quite sensitive to star phenomena. Second, analyze the reason why Grand Astrologer Fu Xiaozhong was killed in Xiantian Coup. It can be seen that there were political battles between the opposing forces of Ruizong’s period using astrology. Then, reviewing the three astronomical aberrations that occurred in February to July of the second year of Jingyun, we can find they are all related to the mutiny in the sense of astrology, and pointed to the Heir Apparent who controlled the Imperial Armies. This is the reason why Ruizong gived his power to his son, as well as confirm the conclusion that Li Longji controlled the Imperial Armies as early as the second year of Jingyun. Finaly, by analyzing the astronomical aberrations after Longji’s ascension, it explains the anomaly that Xuanzong had been in power, but was constantly losing control of Grand Councilors and Censorate.

Finally, Ruizong was an emperor who valued clan harmony very much in the early Tang. In the face of the contradictions between his son and his sister, he always took measures to banlance. It is reflected in the configuration of the ruling officials in his reign, especially the choice of the chief of the Administration Chamber and the Cesnsor-in-chief. Although this balanced approach did not prevent two sides going to war, by sorting out this process, we can understand Ruizong and grasp this period more clearly.