First of all, it takes Chang 'an in the Tang Dynasty as the background, and expresses its praise for the prosperous times of the Tang Dynasty by depicting the bustling scene of Chang 'an in summer and delicious lychees. Bai Juyi, a poet, skillfully combined litchi with summer scenery, showing the prosperity and vitality of Chang 'an in Tang Dynasty. This allows us to appreciate the magnificent scene of the prosperous Tang Dynasty and have a deeper understanding and sentiment of that era.

Secondly, litchi in the works is not only a kind of food, but also an attitude towards life. Through the delicate description of litchi, the poet expressed his love for life and his pursuit of beautiful things. The bright colors and delicious taste of litchi symbolize the beauty and happiness in life. This makes us cherish every detail of life more and learn to appreciate the beauty and joy in life.

In addition, litchi in Chang 'an also conveys a profound concept of social justice. In the poem, the gap between the rich and the poor did not affect the beauty and delicacy of litchi. The poet believes that social resources should be fairly distributed to everyone, not just concentrated in the hands of a few people. This kind of thought makes us think more deeply about the real society and inspires our belief in pursuing social fairness and justice.

Finally, this work also shows us the spiritual outlook and humanistic feelings of ancient literati. With delicate brushwork and profound thinking, Bai Juyi closely linked litchi with life and society, showing his love for life and sense of responsibility for society. This makes us have a deeper respect and understanding for ancient literati, and also has positive enlightenment for improving our own humanistic quality.

In a word, Chang 'an Litchi is an enlightening work, which allows us to appreciate the magnificent scene of the prosperous Tang Dynasty, feel the beauty and joy of life, think about social fairness and justice, and at the same time show the spiritual outlook and humanistic feelings of ancient literati. This work will have a far-reaching impact on us and inspire us to think and feel about life, society and history.