After a while googling for making a list of lastest posts in Jekyll, I finally found the solution. Simply add this code to any page you want the list to appear.
Actually, it is nearly the same with the default post list that Jekyll Bootstrap auto creates in the index file when installing Jekyll Bootstrap. I just add the limit:20 in the for loop so that when I have many posts the list will not expand too long. Based on this you can make your site look more professional by customizing it to dislay the newest post in which category. ;)