從江澤民時代的「江八點」、胡錦濤時代的「和平發展」，到習近平時代《告台灣同胞書》40週年談話，中國對台政策確實呈現出由「彈性模糊」逐步轉向「明確收束」的變化。整體來看，這種轉變並不是單一政策調整，而是由多重結構性因素疊加推動的結果。

首先是兩岸實力對比的快速變化，構成了政策調整的底層邏輯。在江澤民時期，中國整體經濟與軍事能力雖然已快速成長，但相較台灣仍存在顯著落差，因此在對台論述上較強調「過渡安排」與彈性設計，例如較早期曾出現較具想像空間的制度構想。到了2020年代，中國成為全球第二大經濟體，整體國力與軍事規模大幅超越台灣，使北京在戰略上更傾向認為自身已具備主導兩岸關係走向的能力，因此對「讓利式統戰」的需求下降，政策語氣也隨之收緊。

其次是台灣內部政治認同的長期變化，使北京對「和平統一」的可行性評估發生轉變。早期北京較多將台灣政治分歧視為政黨競爭問題，認為透過與主要政黨互動仍可能維持統一的政治想像。但隨著世代更替，台灣社會出現明顯的本土認同強化趨勢，特別是年輕世代中「台灣認同」穩定上升，使北京逐漸傾向認為傳統的「情感統合」或「民族敘事」效果有限，因此政策重心轉向強調制度性與法律性框架的主張。

第三是中國自身對外戰略定位的改變。從江胡時期的「韜光養晦」到習近平時期更強調「大國崛起」與「主動塑造國際秩序」，中國對外政策的風格更加積極。在這樣的架構下，台灣問題被提升為核心利益中的核心議題之一，並與民族復興的敘事緊密綁定，使其政治時間感與緊迫性顯著提高。在此背景下，中國更傾向避免任何可能長期固化為「兩個政治實體」的安排，因此對模糊性制度設計的接受度下降。

第四個因素來自香港經驗對政策思維的反向影響。北京在觀察香港「一國兩制」實踐過程中，特別是在2019年反送中運動之後，對高度自治模式的風險評估發生重大調整。在其政策敘事中，香港經驗被部分解讀為制度性漏洞的顯現，因此在對台策略上更強調風險控管與主權完整優先，並逐步轉向以經濟整合、制度對接與社會融合等方式推進長期整合，而非單純依賴政治協商。

最後，領導層治理風格的差異也加深了政策路徑的變化。江胡時期更傾向維持現狀穩定，重點在於防止台灣走向法理獨立；而在習近平時期，政策敘事則進一步強調歷史任務與民族目標，使「統一」本身被視為必須逐步完成的戰略目標，而不只是風險管理議題。

整體而言，這種從「彈性」走向「收束」的變化，本質上是國力結構變遷、台灣內部認同轉型、國際戰略定位提升，以及制度實驗經驗修正等多重因素共同作用的結果，使兩岸政策逐漸從過去較開放的政治想像，轉向更強調主權與控制邏輯的治理框架。

From the era of Jiang Zemin’s “Eight Points” policy, through Hu Jintao’s emphasis on “peaceful development,” to Xi Jinping’s 40th anniversary speech on the “Message to Compatriots in Taiwan,” China’s Taiwan policy has indeed shown a gradual shift from “flexible ambiguity” toward “clearer tightening.” Overall, this transformation is not the result of a single policy adjustment, but rather the outcome of multiple structural factors interacting and reinforcing one another.

First, the rapid change in the balance of power across the Taiwan Strait forms the underlying logic of this policy shift. During Jiang Zemin’s period, although China’s economic and military capabilities were growing rapidly, there remained a significant gap compared to Taiwan. As a result, Beijing’s discourse toward Taiwan emphasized transitional arrangements and flexibility, including earlier conceptual proposals that allowed for broader institutional imagination. By the 2020s, however, China had become the world’s second-largest economy, with overall national power and military scale significantly surpassing Taiwan. This shift led Beijing to increasingly believe it had the strategic capacity to shape cross-strait relations, thereby reducing the need for incentive-based united front strategies and resulting in a more constrained and assertive policy tone.

Second, long-term changes in Taiwan’s domestic political identity have altered Beijing’s assessment of the feasibility of “peaceful reunification.” In earlier periods, Beijing tended to interpret Taiwan’s political divisions primarily as party competition, assuming that engagement with major political parties could sustain the political imagination of eventual unification. However, with generational change, Taiwan has experienced a clear strengthening of local identity, especially among younger cohorts where identification as “Taiwanese” has steadily increased. This has led Beijing to increasingly view traditional emotional integration or nationalist narratives as less effective, shifting its policy focus toward institutional and legal frameworks instead.

Third, China’s own evolving external strategic orientation has contributed significantly to this change. The transition from the Jiang-Hu era’s “keeping a low profile” approach to the Xi Jinping era’s emphasis on “great power rise” and proactive shaping of the international order reflects a more assertive foreign policy posture. Within this framework, the Taiwan issue has been elevated to a core interest closely tied to the national rejuvenation narrative, increasing its perceived urgency and strategic weight. As a result, Beijing has become more reluctant to accept arrangements that could permanently solidify a “two political entities” status quo, reducing tolerance for ambiguity in institutional design.

Fourth, lessons drawn from Hong Kong have also influenced policy thinking in a reverse direction. In observing the implementation of “one country, two systems” in Hong Kong, particularly after the 2019 anti-extradition protests, Beijing’s assessment of high autonomy models underwent a significant reassessment. Within official discourse, the Hong Kong experience has partly been interpreted as revealing structural vulnerabilities. Consequently, Taiwan policy has increasingly emphasized risk control and sovereignty integrity, while gradually shifting toward long-term integration through economic linkage, institutional alignment, and social convergence rather than relying primarily on political negotiation.

Finally, differences in leadership governance style have further reinforced this policy trajectory. The Jiang-Hu era was more focused on maintaining stability and preventing formal Taiwanese independence, whereas the Xi Jinping era has placed greater emphasis on historical mission and national goals. In this framing, reunification is not merely a matter of risk management but a strategic objective to be progressively achieved.

In sum, this shift from flexibility toward tightening is fundamentally the product of changing power structures, evolving identity politics in Taiwan, China’s rising global strategic positioning, and feedback from institutional experimentation. Together, these forces have gradually moved cross-strait policy away from a relatively open political imagination toward a governance framework more strongly centered on sovereignty and control.