you are not Chinese, so they can't do anything about the length of your hair other than marvel at your flowing locks as you toss them in the wind 

seriously, depending on where you are working, unless there is a strict dress code due to the nature of the work-place there is not much they can do.

From your own perspective, as long as your hair is neat, it should be ok.

I have never discussed this with anyone, but I have at a couple of occasions observed long haired dudes out in public. Often they are flanked by not one, but two above average looking girls. 

Remember there are different ways of growing your hair as a man. 

Don't do this

In China, it probably isn't associated with the progressive '60s. It's more likely you'll be perceived as some superstitious traditionalist who visits a monastery and lets a shifu dictate your hygiene and grooming. Though it might seem strange that you are a foreigner, it isn't unheard of. You will come across as backward and outdated unless you make an effort to assert your different-ness. Most locals are exactly that, but they wouldn't be caught dead *looking* backward and outdated. You will get little respect for your appearance, and people will be less interested in you. It might seem nice to get less attention on the street, but in practice it will hurt your career, opportunities, and you'll be perceived as stupid (=weak), making you a viable target for whatever malicious scam locals have cooked up. I'd get a haircut if I were you.

I think it is, too sad, long hair look good on Asian men, look at Japan and South Korea, most singers have those impressive visual key hairstyles and girls are crazy about it. In another way Chinese have awful tastes when it comes to fashion, design or luxury.

I'm a guy, and I have hair past my belt.

I sometimes get looks (but hey, who doesn't?), but I haven't noticed much commentary (but I could be deaf).

I *DO get respect in what I do (well, except from my students - but they're lazy).

If someone comments on it to me (in English), they are usually assuming I am an artist, as it's the artists and musicians who are more likely to have longer hair.

The legal contract I have with work says I have to have short hair. The 'real' contract doesn't. (of course, the legal contract says I have to work a lot more than I do ;p)

Only if it's worn up in a beehive and accompanied by high heels and a skirt.

I'm really kinda surprised at this thread...I think chinese men are WAY less conservative than americans at least when it comes to flashy haircuts being socially acceptable.

I know tons of normal corporate guys that must visit a barber/salon at least every 10 days or so to keep up their style. I don't think you see that at a big office in the west from younger professionals. Not making a judgement on that either way, but I think in general we're way more conservative about mens haircuts than they are.

I like men with long hair,it is very sexy in my eyes.Having a long hair won't make the men lookl girly.It was just some people's idear.But most Chinese do not appreciate men with long hair,they think it makes a man girly.But who cares,my ex has a bit long hair and has earings,he is nothing girly.His friend has the blonde very long hair,this guy's hair might be longer than his gf,but he is nothing girly.

Grow yOur hair if yOu wanT to, dOnt care about what Others think. Just keep it decent anD keep yoUr job. But I BEG plEas DOnt grow your nails. These chinese Men wIth there long dirtY nails are DISGUSTING. 

Get a haircut and get a real job. Clean your act up and don't be a slob. 

It only depends on whether you have a handsome face..... If not, don't try, we may laugh at you...

If you're a teacher or someone else that should be respectable then long hair is usually ok, but nothing too outlandish.  If you've got dreadlocks and tattoos then parents will take one look at you and send their little emperors elsewhere.  Sorry.