i want to change the font for text 1 in drafting ...because its looks like I in drafting sheet...So how i can change? or which font i used

We switched to Isofont to get the one's to look different from lower case l's.

Using a different font is one approach.  If you do want to make a customized version of the basic 'font' font, you could (in loadpoint/text/usascii) copy font.ndx to better_font.ndx, and replace the line 'ascii.src' with 'better_ascii.src'; copy ascii.src to better_ascii.src and modify the section

"1"
m 8, 16
d 8, 4

to have the extra stroke(s) desired, and employ compile_font to make it into a font.  See http://support.ptc.com/cs/cs_23/howto/kmf157/kmf157.htm "Suggested Technique For Creating Custom Text Fonts" for details.