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http://www.travelchinaguide.com/cityguides/beijing/dinning/indian.htm  

Indian Restaurants in Beijing

Ganges Indian Restaurant

Chinese name: 恒河印度餐厅(héng hé yìn dù cān tīng)
Average Cost per Person: CNY70
Recommended Dishes: Yoghourt, Butter naan, Lamb Rogan Josh
Ganges Indian Restaurant (Shijitianjie Branch)
Location: Bldg 1, World Trade Business Center, No.9, Guanghua Lu, Chaoyang District
Ganges Indian Restaurant (Chengfu Branch)
Location: 1/F, Sancaitang Mansion, No.160, Chengfu Lu, Haidian District

 Tandoor
Chinese name: 天都里印度餐厅(tiān dū lǐ yìn dù cān tīng)
The restaurant is decorated with dense Indian feature with lections hanging on the ceiling. The dinners can enjoy the traditional Indian dancing performances while eating. But the price is a little high.
Average Cost per Person: CNY200
Recommended Dishes: Mango Yoghourt, Chicken Curry
Hours: 10:00 - 23:00
Location: 1/F Zhaolong Hotel, No.2, Gongti Beilu, Chaoyang District
Bus Route: 703, 403, 120, 113, 701 (get off at Zhaolong Hotel Stop)

 Indian Kitchen
Chinese name: 印度小厨(yìn dù xiǎo chú)
It is an Indian restaurant in embassy area and the manager as well as the chef is Indian. Except for the ordinary dishes, the restaurant offers buffet with a fare of CNY38 per person for lunch.
Average Cost per Person: CNY65
Recommended Dishes: Curry, Masala Milk Tea, Masala Fish, Lassi
Hours: 11:00 - 14:00 17:00 - 23:00
Location: 2/F, No.2, Sanlitun Beixiaojie, Chaoyang District

 RAJ Indian Restaurant
Chinese name: 拉兹印度音乐餐厅(lā zī yìn dù yīn yuè cān tīng)
Average Cost per Person: CNY80 
Hours: 10:00 - 23:00
RAJ Indian Restaurant (Gulou Branch)
Location: No.31, Gulou Xi Dajie, Xicheng District
RAJ Indian Restaurant (Xingbalu Branch)
Location: No.22, Liyumen Entertainment Street, Xingba Lu, Chaoyang District

 Taj Pavilion
Chinese name: 泰姬楼印度餐厅(tài jī lóu yìn dù cān tīng)
Average Cost per Person: CNY130
Recommended Dishes: Vegetable Samosa
Taj Pavilion (Guomao Branch)
Location: L128, 1/F, Guomao Mansion (West), No.1, Jianguomenwai Dajie, Chaoyang District
Taj Pavilion (Lidu Branch)
Location: 3/F, Lidu Holiday Inn, No.6, Jiangtai Lu, Chaoyang District

 Mirch Masala Indian Cuisine
Chinese name: 马沙拉之香印度餐厅(mǎ shā lā zhī xiāng yìn dù cān tīng)
Average Cost per Person: CNY70
Recommended Dishes: Mango Yoghourt, Fried Indian Beancurd with Spinach Curry, Vegetable Samosa
Mirch Masala Indian Cuisine (Nanluogu Xiang Branch)
Location: No.60-2, Nanluogu Xiang, Xicheng District
Mirch Masala Indian Cuisine (Shenlu Street Branch)
Location: No.130, Building 2, Ritan Shangjie, Block 39, Shenlu Street, Chaoyang District

 Asian Star
Chinese name: 亚洲之星新马印度餐厅(yà zhōu zhī xīng xīn mǎ yìn dù cān tīng)
Average Cost per Person: CNY150
Hours: 11:00 - 14:30 17:00 - 23:00
Location: 26 Dong Sanhuan Bei Lu, Chaoyang District

 The Mughal's Restaurant
Chinese name: 莫卧尔印度餐厅
Average Cost per Person: CNY90
Hours: 09:30 - 15:00 18:00 - 23:00; 11:00 -23:00 on Saturday and Sunday
Location: 4F, Nali Garden, 81, Sanlitun Bei Jie, Chaoyang District

 Tamarind
Chinese name: 泰玛利
Average Cost per Person: CNY60
Hours: 10:00 - 14:30 17:00 - 22:00
Location: Room 161, B1, Shangdu Bei Lou, 8, Dongdaqiao

I've been to one of the indian restaurants. Although I didn't particularly like the food the indian t.v. show they were showing was entertaining. I don't eat Indian food enough to tell you but here are some decent one's with some recommended dishes. I'm sure you would know more than me.

Love Ganges Indian Restaurant!  They have plenty of locations around Beijing. Each has consistent service, food, and look. 

Thanks a lot for the information 

there is one in wu dao ku near from next to wu dao kou subway station ,  hua liang ( u center ) 6th floor. it's really one of the top indian restaurant in beijing.

Ganges is the best . And has very good lunch buffet mon to fri