Can I use the rune in the world map? how to recover the health of some team member outside the battle map? I tried in party window, but can't work....

You can't use runes on the world map and you can recover health on the world map either by spell or by healing in the city if you have build a temple.

Like Larkin said, runes won't work on the world map.

You can recover health on the world map with:
- Potions
- Spells
- Adventure objects (such as Healing Springs)
- Heal in city, if you've build the Temple in your capital

Yep, and on a similar note - potions (except healing and rez) cannot be used during combat. They can only be drunk before or after. Think of them as needing a bit of time for the effect to occur.

Thanks, all.
How to use portion to recover the health in world map?

Open the inventory and drag the potion on the image of the unit to be healed.