1.Try to contact only with the supplier from Alibaba which with 3year+ member ship
2.Not trust the very cheap price supplier, cheap price sometime means cheat or bad qualilty and service
3.Not Contact supplier which sell over 5different serial products on website.Only a trading company can sell so much products
4.Choose supplier with detail and complete company info
5.Contact supplier which email you under their company name's domain email.Not Free mail like Gmail,hotmail,yahoo...
6.Check the Supplier if with a Trust Profile from Alibaba
7.Pay to supplier's company bank but not to private bank.