Are you asking whether they get married in the play? If so, see Act II, scene 6, where Friar Laurence marries them. See the summary linked below.
Or are you asking whether in real life Romeo and Juliet would get married? They are both very young, in most states too young to get married without parent permission, so it is unlikely that they could get married in reality. If their parents were smart, they'd let them see each other. They might find out that they are attracted to each other so much because a relationship is forbidden to them.