Everything.
Civilization:Great civilization for nearly 5000 years.One of the oldest continuous ancient civilization,also has the biggest territory and population among these ancient civilizations.
Culture:Hundreds of philosophers,its moral and philosophy spread the whole Asia.Even today,asian countries like japan,korea and Mongol has many same customs which come from China.
Language:The only living Hieroglyphic，which is more than 4000 years old.Even today,people still use traditional Chinese which is widely regulated and used 2000 years ago.And most of all,Chinese can read 2000-year ancient books easily,which is impossible for any other languages.This is because Chinese has its unique grammar and writing system.Chinese people has hundreds of dialects,but they all use the same Chinese writing system.And,among all UN reports books,Chinese version is always the thinest,because Chinese language is succinct and informative.
Art:Chinese music,dance,buildings,clothes,paintings,…
Medicine:Chinese medicine which is very famous and scientific.Also invented the first anesthetic 2000 years ago.
Technology:Invented 1 porcelain，2 lacquerware，3 Compass,4 silk,5 modern paper,6 Printing,7 gunpowder，8 crossbow 9 repeative crossbow,10 Wheelbarrow,11 Plows,12 the decimal system，13 the equator coordinates ，14 first record of sunspot, the Halley's Comet， supernova 15 seismometer，16 Armillary Sphere 17 longth of meridian 18 abridged armilla 19 obliquity of the ecliptic 20 abacus 21 the Pythagorean theorem 22 anesthesia 23 kite 24 umbrella 25 rice wine 26 stirrup 27Chinese calendar28glasses29watertight compartment of boat 30pi 31vernier caliper 32tea 33 vaccination 34 grand canal 35 great wall 36 early seismological detectors,37 matches,38 pound locks,39double-action piston pump,40 blast furnace and cast iron, 41the multi-tube seed drill, 42the suspension bridge43natural gas as fuel, 44the differential gear for the South Pointing Chariot,45 the hydraulic-powered armillary sphere, 46the hydraulic-powered trip hammer, 47the mechanical chain drive, 48the mechanical belt drive, 49the raised-relief map, the propeller, 50 the cannon, 51the rocket,52 the multistage rocket,55Liaodi Pagodar,maybe the tallest building in ancient world,about 100 m 56 Chinese characters,the only living Hieroglyphics 57 Chinese medicine58 Chinese Kongfu 59 Xuankong Temple 60 ...etc.
Military: The largest country in the world for thousands years,also beat huns,mogols(Only ruled by mogol for 90 years because of civil wars(That time China was not united),but China has beat mogol for 1000 years,so I say China beat mongol ) .Always has an army above 1 million.General Huo qubing beated Huns by acrossing Gobi Dessert which is 1500 km from China.Also,has the biggest navy in 15th century.China forceed huns fight western to survive.
Buildings:Great woodern buildings.Has 2 wonders of the world.Great Wall and Porcelain Tower(which is the tallest building in ancient time),biggest palace,biggest dam,biggest tomb.biggest ....too many.
Sailing:Do business with Africa since ancient time.
And many other things.Check it on wiki.
