Hey and welcome to my Xin chao guide. Normaly i only play jungle and Xin chao is my main in the jungle. I hope you will enjoy my guide and im sorry for my bad english by the way :)

Also check out this guide here :)
http://www.mobafire.com/league-of-legends/build/xin-zhao-ranked-bot-jungle-solo-top-updatig-7-19-2012-168555

Challenge (Passive)
Xin Zhao challenges his target with his basic attacks and Audacious Charge, reducing their Armor by 15% for 3 seconds. Only one target can be challenged at a time.

Three Talon Strikes
Now reduces his other ability cooldowns by 1 second with each strike
Attack Damage ratio increased to 1.2 from 1.0
Cooldown reduced to 9/8/7/6/5 seconds from 10.

Battle Cry
Passive: Heals Xin Zhao for 26/32/38/44/50 (+0.7 Ability Power) every third basic attack
Active no longer reduces other abilities' cooldowns
Cooldown reduced to 16/15/14/13/12 seconds from 24/22/20/18/16
Mana Cost increased to 40 from 35.

Audacious Charge
Now challenges the target
Damage increased to 70/115/160/205/250 (+0.6 Ability Power) from 70/110/150/190/230 (+0.4 Ability Power)
Slow increased to 25/30/35/40/45% from 20/25/30/35/40%
Slow duration increased to 2 seconds from 1.5
Range reduced to 600 from 650
Cooldown reduced to 13/12/11/10/9 seconds from 16/15/14/13/12

Crescent Sweep
Now knocks all unchallenged targets back
Now has a 1.0 bonus Attack Damage ratio
Cooldown increased to 100/90/80 seconds from 75
Armor and Magic Resist bonus adjusted to 15/20/25 per champion hit from 25 + 7/10/13 per champion hit.
Now has a new particle.

Just go around in the jungle and farm thats just it :)

Pros:
Distance closer;
Knock up;
Group slow;
Natural heal;
Unstoppable when feed;
Extremely fast;
Lanes well with stunner.

Cons:
Picked on by ranged
A bit slow without items
Vulnerable to cc
No escape mechanism (except speed)