If you want to sponsor them under AINP family stream, see
http://www.albertacanada.com/immigration/immigrate/familystream.html you need to have been living in AB for 2 years and your parents need to both be under 45 when you apply and fulfill other requirements.
If that is not the case, you must sponsor them under the federal system see
http://www.cic.gc.ca/english/immigrate/sponsor/index.asp for requirements. You don't need to have lived in Canada for a certain amount of time but you do need to show that you have enough income to support your parents financially.