is it better to start a new hompage?

We established our new website in year 2011, it is http://www.fatech-surge-protection.com. Our main products including photovoltaic surge protection products, surge arrester China for power supply systems, surge protector China for protection of signal system, lighting rod, and test devices.
Is it better to have another language website in the same domin or use another domin?

 

You will want to use your same domain. Just offer different language options on your site if you want to do that. Your google rank will drop for duplicate content if you are using the same site just change the langauge. Only reason to use a different domain name would be if you were using different content.