Answer:
The ban caused China to isolate themselves from other countries, which greatly affected their economy because it stopped overseas trading.
Since they stopped making ships, it stopped them from exploring. It did help when it came to external conflicts between other countries however, it kept them from trading with other countries as well. They did allow foreigners to trade in China, but only if they accepted that the Chinese Civilization was superior to theirs.
This stunted the growth of their economy and also their technological advancement because they couldn't go out to gain more knowledge or information from the outside world. With a weak economy, it affected the power of China, lessening it to a great extent.
I hope this was the answer you were looking for.
