please help me ,thanks.

1.China (China is a noun so it should be capitalised) is one of the oldest cultures in the world .(It's base of make the modern world that from of china) . (not sure what you're trying to say in that senetnce)
2.China has the most of the quickly growing economy all in of the world and is getting going through a new industrial revolution.
3.China was starting has started a plan of space exploration, (in most cases a comma is not used before "and") and is incloud aiming to finish the building of it's space station by 2020.
4.now,China it's is now the biggest exporter of all in the world and attracts a large number of investors from foreign countries.
5.in the Meanwhile, China was has been investing billions of the into foreign countries.  In 2011, China became the second (biggest?) economy country over the after Japan.

please help me , thanks.

General notes:

Countries are nouns, they need to start with a capital letter.

Any words coming after a full stop should start with a capital.

There should always be a space after a full stop or a comma.

Don't start sentences with "and".

~good luck