First of all, let’s briefly talk about the definition. Modern Chinese poetry mainly refers to poetry written in modern vernacular since the New Culture Movement. The first collection of poems was Hu Shi's "Anthology", and those before the New Culture Movement were classified as ancient Chinese poetry (including ancient poetry and modern poetry).
The following are the differences:
Form: Ancient poetry was written in classical Chinese, which is basically a combination of classical Chinese (modern poetry is probably still the same, although it was close to vernacular in the late Qing Dynasty), modern poetry Created using modern albino script.
In terms of poetry structure, ancient poetry has strict norms (especially modern poetry) and fixed creative forms, such as Qi, Cheng, Zhuan and He, strict Dui Zhang, forbidden palms together, Zhu Nian, etc.: such as Yuefu and rhythmic poetry. Modern poetry has a freer structure and no strict rules. In terms of rhyme, ancient poetry has regulations whether it adopts one rhyme or alternate rhyme. Modern poetry pursues an inner sense of rhyme and rhythm.
The spiritual aspect of poetry: Ancient poetry was influenced by ancient Chinese philosophy and times, and generally had the appearance of poetic ambition or the pursuit of a harmonious "Tao". For example: expressing frustration in life and lamenting the emotional state: Chen Ziang's "Deng Youzhou Taiwan Song". For example: a work for socializing and singing, and a work for farewell (Li Bai's "Gift to Wang Lun"). For example: Expressing the pursuit of "Tao": Wang Wei's poems, Tao Yuanming's poems, etc.
The spirit of modern poetry: Modern poetry was first influenced by the West, and the old and new came out. Later, it showed China's open mind, post-red poetry, underground writing, hazy poetry, avant-garde poetry movement, etc., showing the combination or departure of the spirit of the New China era, and the emergence of inheriting tradition and absorbing the West. Generally speaking, current poetry shows a kind of and material spirit. That is, it is closely related to current daily life.
PS: You have to do more Baidu in this regard, and you will basically understand it.