Chinese Astrology and Western Astrology differ in many ways. Some astrologers tend to use Western Astrology in love compatibility. Through the method of analyzing the horoscope signs compatibility, the first and most common method is by comparing the signs of the couple. The compatibility is based on whether the horoscope signs belong to the same element. Aries, Leo and Sagittarius are FIRE signs. Taurus, Virgo and Capricorn are EARTH signs. Gemini, Libra and Aquarius are AIR signs. Cancer, Scorpio and Pisces are WATER signs.
Another method with Western Horoscope signs is the usage of sun signs and moon signs. A couples sun signs and moon signs. (You can get the moon signs from astrology books. They have a table which shows the sign that the moon is at during the day you are born. It differs from year to year.) The astrologer will compare both sun signs. Then compare both moon signs. Cross over and compare sun sign with moon sign and the other way round. The minimum criteria are to have at least 2 matches in the 4 comparisons.