How did china affect japan's political development? (

Depends on the era. If you're talking about WW2, China affected Japans Political development through national competition and past differences. If you're talking about Modern, it would be the same answer. However, if you meant Ancient, then the correct answer would be the war economy system that propagandized the situation to gain base war support.

The buddhist religion came with the rest of early Chinese culture and made an impact. Buddhism was based on the Chinese influence. At the same time, confusion concepts of the government and society also arrived in Japan.