Hello i am traveeling to Edmonton on 8th aug sun. Want to plan my Trip for 7 days. Want cover most places like jasper banff lake Louise moraine lake peyto lalke gondola canmore waterton sky walk ice field trip. How should i plan? Reasonable stay car rrntal?

I'm assuming you're flying out of Edmonton as well?

Yeah, I guess it's doable, but tight. Edmonton to Jasper is a 4 hour drive. Banff to Waterton is 4 hours. Waterton back to Edmonton is atleast 5 hours in good traffic. So it's atleast one full day and two half-days of driving just to get between places.

Right now your itinerary would look something like this:

Night 1: Edmonton (unless you arrive early enough in the day that you can pick up a rental car and get to Jasper in the evening.)
Night 2-3: Jasper
Night 4-5: Banff
Night 6: Waterton
Night 7: Edmonton

With the limited time you have, cutting out Waterton and spending an extra day in the Banff/Canmore area might be a better option.