Hassan - almost regardless of discipline, you can investigate most things qualitatively. If you want to know past and current beliefs, attitudes, values, experiences, observations etc - then qualitative is the way to go.
Dear Hassan, I definitely echo the response of Dean. In addition, it is tied to a branch of qualitative research known as ethnography - the study of the cultures, values, history etc of a group of people. In relation to archeology you might want to relate the cultures, practice, and beliefs of a group of people using qualitative methods.
Further to Ferdinand's answer, yes qualitative research is possible in archaeology, however, you need to be very careful. The majority of existing literature is riddled with misunderstandings resulting from authors deconstructing ancient texts with the result that they actually act as a tool of confirmation bias for the author. On a positive note there are 2 regular conferences here in the UK that you might look up via your uni's library.
The first is TAG, Theoretical Archaeology Group.
The second is TRAC, Theoretical Roman Archaeology Conference.
TAG usually act as a publisher for larger monographs, while TRAC tend to publish their conference proceedings. TRAC may be more accessible since a quick trawl of Cardiff Uni's catalogue indicates that most of these have online access. Both organisations specialise in the sort of question that you are asking.