This video should help you! Ultimately, this link should help even more.
http://www.leadingedgepetcare.com/cats-in-the-christmas-tree
Source(s):
http://www.truveo.com/How-To-Keep-Cat-Out-of-Christmas-Tree/id/2705388280

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Read this article:

http://www.associatedcontent.com/article/93555/how_to_keep_your_cat_out_of_the_christmas.html?cat=53

Consider yourself lucky though because I had a much worse problem - a large male doberman who kept trying to pee on the Christmas tree!
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My wife and I got our cat her own tree; it is a little one about a foot and half tall with a stuffed base. She attacks that, kind of like a scratching post, instead of our big tree now.
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WikiHow is a great source of information: http://www.wikihow.com/Cat-Proof-Your-Christmas-Tree

A couple of gems from this article that might help you:
-To protect the cats from tipping the tree over, you can attach the top of the tree to your ceiling with high test fishing line and duct tape the stand's legs down.

-To dissuade them from enjoying the tree quite as much, you could spray it with Bitter Apple (Granick's Bitter Apple) which is safe and natural but very icky to taste.

-WikiHow also says that they don't like the smell of oranges -- orange peels at the base of the tree or even as improvised lower-ornaments might help keep them out.

-You can also dissuade them with the old fashioned "spray them with water" routine. An excellent assistant to this would be jingling ornaments on the lower branches, so you can hear if they do go on the tree and come in to spray them.
Source(s):
http://www.wikihow.com/Cat-Proof-Your-Christmas-Tree
http://www.thecatsite.com/Care/11/Cats-and-Christmas-Tips-For-Cat-Owners.ht...

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We love kitties and have had many in our home at Christmas time. The tree is always an irresistable feline attraction. Kitties simply cannot help themselves when it comes to colorful, fragrant swinging baubles!

A couple of things which work:

1. "Cat Scram" Electronic device: http://www.odordestroyer.com/Merchant2/merchant.mv?Screen=PROD&Product_Code=CSCRAM&qts=google_ppc&qtk=cat%20repellent&AFFIL=google

2. Spray Repellents (such as these at Petco): http://www.petco.com/petco_Page_PC_productlist_Nav_207_N_23+140.aspx

Good luck and Merry Christmas!
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I have had good results with these:

http://www.safepetproducts.com/pilot.asp?pg=scatmat

The shock is less severe than a static electric shock.
Source(s):
Experience with three kittens that broke several family heirloom ornaments until I bought the mats.

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Growing up we always used strong spices. Things that have a hot flavoring to them. Sprinkle some of it on and around the tree and a little one his nose when he goes for it the first time. It usually did the trick.
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Put your Christmas tree on the roof, line your roof with an 8-foot-tall barrier wall made of glass, then put your cats in a sealed box on the moon, and they MIGHT not get to it.

Sorry if that wasn't too helpful, but I've learned from dealing with this for years and years that there's absolutely nothing you can do to keep your cats from exploring their second favorite hiding place in the whole world. (First favorite is under the bed, when you're trying to put them outside.) You'll just have to rebuild things once in a while. Don't worry, they won't hurt themselves.
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It looks like many other people have encountered this problem. After a bit of online research, it seems like there are several solutions to keeping your cat out of your tree:

1) Place the tree off the ground if possible. Even though cats can jump, some people claim this works since it's not as accessible.

2) One family actually placed a screen "fence" around the tree. Though this seems extreme and not very aesthetically pleasing, if you could do it it's a pretty much guarantee to keep the cats out.

3) A few people online suggested spraying "repellents", such as citrus, pepper, bitter scents, or "NO SCRATCH", on the tree - whether it's real or fake. It looks like these sprays are available at your local pet stores. See http://www.thriftyfun.com/tf36241391.tip.html

4) It seems to be a myth that aluminum foil works - most comments I saw say that it does NOT.

5) Also, on a side safety note, do not use tinsel to decorate. Apparently many cats become entangled in it and can strangle themselves. Not a very happy holiday then.

Hope this helps!
Source(s):
http://www.thriftyfun.com/tf36241391.tip.html

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Put a dog in there.
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I actually had a friend tell me that they got some sort of alarm or something for their tree so that when the cat tried to climb on it or play, the alarm would go ff and scare the cat away.
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fire
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Motion-activated module plus blender plus sound:

http://www.plasma2002.com/blenderdefender/
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