Q:

How to make the x-lable to process geometric progression datas in gnuplot? 

The x-lable datas are geometric progression, like: 50000000, 5000000, 500000, 50000, 5000, 500, 50, 5.  However, the default in gnuplot is arithmetic progression.  How to make my graph looks good when taking these datas? 

A:

You might want to use a log scale:
set logscale x

