In a long run Leo could feel hemmed in or restricted by Capricorn who, in turn, will feel that Leo's ways are extravagant or demonstrative. Leo likes to live life to the full, whereas capricorn being too cautious and conservative, likes to plan for the future. Capricorn, emotionally reserved and fairly undemonstrative, seldom realizes that Leos will feel starved unless given lots of love, affection and appreciation.
This pairing is like summer and winter getting together and this can make the temperature go up and down.
Capricorn-Leo Compatibility

These two can respect each other enormously when they're both embroiled in a business relationship.The lively Leo will be fabulously flamboyant and winning orders galore, while the canny Capricorn will be in the background. If love is to last, these two have both got to learn to give way more and not be so incredibly intransigent. Just as long as this pair practice powerful passion and not passionate power, they should have a whale of a time. There should be no intruders into their private area.

Aries (Mar 21-Apr 19) Taurus (April 20 - May 20) Gemini (May 21 - Jun 21)
Cancer(June 22 - July 22) Leo (July 23 - Aug 22) Virgo (Aug 23 - Sept 22)
Libra (Sep 23 - Oct 22) Scorpio (Oct 23 - Nov 21) Sagittarius(Nov 22-Dec 21)
Capricorn (Dec 22 - Jan 19) Aquarius (Jan 20 - Feb 18) Pisces (Feb 19 - Mar 20)

In general the above Generic compatibility analysis hold good for all zodiac signs. If you are looking for in-depth compatibility analysis or if you are a professional astrologer the below analysis of Zodiac signs Compatibility - between different gender of zodiac signs will give you detailed answer. Click the below link to learn more.

Capricorn Man

Capricorn Man Compatibility

Capricorn Man and
Leo Woman

Capricorn Woman

Capricorn Woman Compatibility

Capricorn Woman and
Leo Man