While you are working, don't be too relaxed. Corporate America doesn't have any mercy for any employees. So, be on the alert all the time.
There are couple of things you could do, in order to weather the layoff storm.
1) Be a key part of the company. Unless the company goes under water, you are safe.
2) Move up the coroprate ladder and be a part of management. This is not easy for my fellow Chinese.
3) Startup something on the side.
This is what I recommend for everyone. If you are good at selling, why not start up a business to sell goods online? If you are good at programming, think about writing some shareware to get money. There is always a good talent you have that others don't have, so, you should just harness that.
Be a mercenary employee, where you collect your money by doing an excellent job at work, then, startup your own business on the side. You will discover your inner strength and enjoy the process.
By doing your own business, you are building up your long-term safty net.
Overall, Corporate America is full of greed and ruthlessness. The best way is to not depend on your employer, but rather, yourself. So, discover what you are good at, and act early. Don't wait until you get that ax.