As a powerful country during the Spring and Autumn and Warring States periods, Qin had outstanding military, political, and economic strength. However, against this backdrop, Qin chose to send Ying Yiren to Zhao as a hostage, sparking curiosity among many history enthusiasts.

Firstly, it's essential to understand that hostages were people exchanged between ancient states to signify trust and a desire for peace. Typically, they were princes or noblemen from each country. This was a common political tactic to maintain peaceful relations between two states.

Qin's decision to send Ying Yiren to Zhao as a hostage was partly to establish closer ties with Zhao through this method. Additionally, it was an opportunity for Ying Yiren to accumulate more experience and knowledge.

Despite Qin's might, during the Warring States period, relationships between states were complex and wars were frequent. Therefore, Qin needed to maintain and expand its influence through various means. Sending Ying Yiren to Zhao as a hostage was one strategy to achieve this goal.

Moreover, for Ying Yiren, being a hostage in Zhao was a form of training and self-improvement. During his stay in Zhao, he could deeply understand Zhao's politics, economy, culture, and other aspects, which had a significant impact on his future political career in Qin.

Overall, Qin's decision to send Ying Yiren to Zhao as a hostage was based on national interests and expectations for Ying Yiren's personal development. It also demonstrated Qin's flexibility and pragmatism in handling international relations.

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