First of all, I'd like to mention "Old Pier Thai Restaurant". This restaurant is located in Guijie Street, Beijing, with elegant environment and unique decoration style. The most important thing is that Thai food here is authentic and the price is moderate. If you are a person who has a special liking for Thai spicy food, this place can definitely satisfy your taste.
Secondly, I would like to introduce "Taiyueju Xiaoman Yaotai Restaurant". This restaurant is located in Beijing's international trade circle, and the environment and atmosphere are very good. It is a good choice for private parties. There are many kinds of menus in the restaurant and the taste is very good. Especially their chicken feet, soft and waxy, are memorable.
Finally, I want to mention "Thai friends of Thai food". This restaurant is located in Joy City, Xidan, Beijing. The food is delicious. It tastes good and spicy. If you want to try some special dishes, their curry beef and Thai roast chicken strips are good choices.
To sum up, if you are a fan and want to find a delicious Thai restaurant in Beijing, try the above three restaurants. You will never be disappointed.