Features: ① The organic combination of unity and diversity. ② The cultural exchange between China and foreign countries is unprecedented. (3) The level is among the advanced in the world. 4 the momentum is magnificent. Reasons: ① National unity and vast territory. The economy is developed and the country is rich and strong. ③ Frequent economic and cultural exchanges among ethnic groups. ④ Exchanges between China and foreign countries have increased. The rulers adopted an open policy. Status: It inherited the legacy of a hundred schools of thought contending in the Warring States Period, and made great progress in scientific and technological achievements. It was one of the centers of several major civilizations in the world at that time, and formed the East Asian cultural circle, which was in a central position and had a far-reaching impact on neighboring countries and even the world culture. "Cultural characteristics" is a simple representation of textbook knowledge. The analysis of "reasons" should be briefly summarized in combination with the politics, economy, ethnic relations and foreign relations in the Qin and Han Dynasties, which is closely related to the characteristics of the times in the Qin and Han Dynasties and is a highly summarized and in-depth analysis topic. "Historical position" has two meanings: one is its position in the history of China's cultural development, and the other is its influence on world culture. Organize the answers according to these two aspects.