I omitted Genghis Khan because is too well-known already and he didn't really unify all of China during his lifetime.

I voted for Qian Long.
His conquests :
Xinjiang, Ili, Outer Mongolia, Xichang, Annam, Myanmar, Nepal

It is also known as the Ten Great Campaigns.

sorry, who's Qian Long?

Qian Long (reign year 1736 – 1795 AD) was the 4th Manchu emperor to rule China during Qing dynasty, after Qing conquered the whole of China. His name is Aisin- Gioro Hongli . During this reign, he led 10 military campaigns that greatly expanded the Qing empire in the western region, for instance against Galdan Mongols.

Qing dynasty reached the zenith of its power and territorial expansion during Qian Long period. After Qian Long, Qing dynasty started to decline.

You can see the picture of Qian Long at
http://www.chinapage.com/emperor/qing1206.html

Qinshihuang uses force to conquer 6 states and unify China. I think, he is the most war-like emperor in chinese history.

I reckon Sui Yangdi is in with a shot, though he wasn't on the list. He may not have been very successful in his military endeavours, but his three massive invasions of Koguryo have to count for something - the sheer effort he went to in order to raise massive armies for those invasions is a tribute to his militaristic nature.

Definitely Sui Yangdi...........
My second candidate is Han Wudi who was succesful in his war with the Xiongnu.......(in most wars)...

The list is not complete and I cannot vote. The most war-like Chinese emperor (or rather, king) IMO was Ran Min.

Alright, I just edited the poll to include "Others (please state)"..

Sui Yangdi should be mentioned for his constant invasion on trying to conquer Korea. Kublai Khan should also be mention for his agressive campaigns to take Japan and Vietnam. Qianlong Emperor probably had the most mentality for extending China to its largest in territorial size for having Tibet, Mongolia, both Outer and Inner Mongolia and even parts of Russia in the Northwestern part of China.

Imagine how China would be like if all of those territories are still apart of China today.

I voted for Qin Shi Huang, he did unite all the six other parts of China.

I vote for Han Wu Di because he extended China's power far beyond its traditional borders and secured the silk route.
Sui Yan Di was also very aggressive, but his reign did not last very long.
Qian Long would be in second place, in my estimation.

Boarhuntr

A candidate i concern is 唐明皇（唐玄宗）Tang Minghuang, (Emperor Xuanzong), Li Long Ji, the 7th emperor of Tang dynasty. His rule pushed the Tang dynasty to its greatest period. Unfortunately, the turn point of the gorgeous middle kindom also occured at his time.
This guy is famous for his love affair with Yang Gui Fei. Coz the love story overshined or overshadowed other things, his war-like character is less known.

He does like war very much, though he did not have many feats in military compared to other emperors. He launched war without reasons sometimes, I mean he waged war arbitrarily. It seems to him war with others is just like an entertainment. He does have strength to play this game.

Li Bai(Bo), one of the greatest poets living in his time, once wrote a poem(战城南) critisizing his combative in nature.

IMO, Qinshihuang is probably the most war-like emperor in the whole of chinese history. This is followed by Han Wudi.

I have to agree with GZ here....

Imagine if Qin Shihuang actually find a remedy to long live, what do you think will happen -.-''.

Everyone would have to wear the same shoe size.

Would make Hitler look like Peace Corps.

Voted Qin Shi Huang, when he served in his own army he had no mercy.

I voted for Emperor Yong Le, He was trained to be a general, and died in a military camp while campaining against the Mongols.

Qin Shihuangdi is probably the most warlike emperor. He became King at a very young age (13 i think) and claim full power at the age of 21. 17 years later, he declare himself emperor after vanquishing other warring states (5 main states i recall). Later, he even ordered the invasions of Vietnam, Korea and several other small ancient nations.

IMHO, King He Lu of Wu State (during Spring And Autumn Period) was a war-o-holic. His life was all filled with war stories.

i didn't vote because i think i lack knowledge about a lot of chineese emperor, but if i were to answer this question, i wouldn't seek clues on effective conquest but rather seek which one of the emperor had organized his state and economy in a "warmongering way". History can force one to make conquest even if he's not willing to, but if one prepare for war , even if he didn't fight a single battle, he could be seen as a war-like emperor.

Without doubt, Qinshihuang was the most war-like Emperor. I don't think he really care about the hardship of people in China.