Both of them share a lot of qualities, a Cancer and a Capricorn has some qualities which do not match with each other. If they understand the mood swings and behavior of each other then there are a lot of chances to become successful this relationship. Capricorn has the habit o f loyalty and reliability but the extreme emotions and mood changes will bring a complete change in their behavior. There is good romantic chemistry between both of them but Capricorn cannot give a lot of love and passion to his counterpart.