Here i have given details from my search on how google tracks your adsense clicks.
If the AdSense click is originated from the same IP Address as the one
used for accessing your AdSense account, your account is flagged.
Most home users do not use static IP Address for Internet connection. In
most cases just disconnect and reconnect will give you a new IP
Address. But don’t forget, Google has set cookies on your computer.
Other Google Services:
Thinking that you are safe just because you do not access your AdSense
account? Think again. This time, consider these: GMail, Google Earth,
Google Calendar, Google Search, Google Toolbar,
Google Talk, Google Sitemap, Google Desktop, Blogger, and so on, and so
on. With the wide range of services they provide, Google can trace the
originator of most (or probably almost all) clicks.
Click Pattern 1 :
Oh, why this computer / IP address / person is so trigger-click-happy on
this particular website but never click on the ads on other sites?
Click Pattern 2 :
And why is it that people accessing these sites direct (type-in URL or
from bookmark) tend to be very active ad-clickers compared with those
referred from search engine or other sites?
Click Pattern 3 :
And why the ad-clickers like to hit and run, compared with non ad-clickers that surf a few pages before leaving?
Click-Through-Rate (CTR) :
Your CTR may range from 0.5% to 10%, but if it exceeds a certain point (probably around 10%), you are flagged.
Used Urchin (Google Analytics) before? Then you should know that Google
can trace traffics origin down to the small town. Different IP doesn’t
mean much. Unless you site is really targetted to one small geo-point, a
high number of clicks from nearby location will get you banned quickly.
Hardware address? :
MAC address of the LAN card, modem, and router works almost like a
fingerprint. I’m not sure if Google can track this, but probably they
do. They have rocket scientist, remember? :
Advertisers conversion rate :
Ad click is one thing. But does it bring value to the advertisers? If
none of the clicks on your site translate to conversion to the
advertiser, you are in trouble. First the Smart-Pricing hits, then your
AdSense account disabled.
Search Engine Ranking:
Your website is not indexed on any search engine, not linked by any
prominent website, but get consistently high traffic? That sounds like
something is in play. Regardless of whether it is an adware-embedded
software, spam, trojan clickbot, or intentionally installed
click-exchange network, it doesn’t sound right.
Webpage design :
How about the “click here” or “support us”? Google has the best search
engine in the world. Is it really that hard to find those words?
Each of these detection methods might seem rather weak. But combine them
together, and not many click-fraud can pass-through these filters. Even
the smartest clickbot will have a hard time.
For more information kindly go through this link:-
And for issues concerns regarding invalid clicks go here:-
And lastly if you think your AdSense account is terminated unfairly, Google provides you a way to make your appeal: