Balabala1221,
Are you planning on just submitting word documents to employers posting jobs? If so, I'm not really sure there is much you can do with keywords.
On the other hand, if you are planning on converting your resume into a website, then you could get that to rank for relevant key terms that employers might be using to find applicants online. You could just make a plain html page with a little styling and then include keywords in the title tag of the site, in the meta description (along with some compelling language to get employers to click through to your resume) and in the copy of the resume. You could make headers in the document and include keywords in there.
Also, you could work on building up your own personal brand online. Make social media accounts around your professional status. Make all the information consistent (in terms of the jobs you are looking for). For instance don't make one social profile about being an avid hiker and another about your engineering stuff. Make them all the same.
You will find that if you can be present in a variety of different places online, you can dominate the first page of results for your name (which employers will certainly search for after they interview you or even before) or for the key term that you think employers are using to look for relevant talent.
Also, make sure key terms that you think employers are using to search for candidates are present in your LinkedIn profile.
Here is a good post on creating a "killer" personal branding campaign,
http://mashable.com/2012/10/06/personal-branding-jobs/
Here is a good tutorial on turning your resume into a website,
http://www.thewebmarketingexperience.com/2012/07/turn-your-resume-into-website.html
Hope that helps you and good luck!
Shawn
