A Capricorn in the Zodiac is the sign of excellence, of achievement and therefore the Capricorn tends to be work oriented, structured, ambitious, and very serious about his or her work. If you, let's say on first meeting, if you also have a passion for what you do, that immediately attracts a Capricorn because the Capricorn then sees in you that you are a person of substance, a person who wants to make his or her life count. That is the immediate attraction. Capricorn is also someone who likes a life of stability but adventure. In other words, if Capricorn is travelling or is going through various relationship issues, the Capricorn wants to explore but at the same time be in a stable situation.
Again, if you can give the impression that you also appreciate and look for stability in your life, it's something a Capricorn likes. In general a Capricorn is highly intelligent, is very drawn to people who have done something with their lives, done something interesting, been places, who have some kind of achievement in their work. Again, work is a key to attracting a Capricorn. In general, longer term, a Capricorn is a stable lover. In other words, it doesn't play around, doesn't cheat, doesn't lie, but can be a bit controlling, can like to call the shots, and you'll have to work your way kind of around that.