本文发表在 rolia.net 枫下论坛TN, H1B, L1A/L1B are all non-immigrant worker visa types, meaning they will NOT immigrate you to the US. You can hold these visas for many years and you will not get your green card if you don't start the immigrant worker visa petition process. But these non-immigrant worker visas do help you build relationship with your employer so that your employer may sponsor you for immigration (getting the green card) down the road. But it all depends on the intention of your employer when they hire you and when you request for immigration sponsorship. Some employers are willing and helpful, many of them are not, and some of them simply don't want the hassle. Also it depends on the business performance and business need at the time. The relationship between you and your manager is very important when you request for immigration sponsorship. When both of you decide to go ahead with your immigration, then a new process starts. You will need to go thru three petitions/applications: labor certificate petition (by employer), immigrant worker visa petition (by employer), and finally green card application (by yourself to change your status from non-immigrant to immigrant, it involves medical examinations, background checks by FBI, and personal information verification).更多精彩文章及讨论，请光临枫下论坛 rolia.net