I often visit Beijing to teach on the Neuroscience and Neuroimaging programme at the Sino-Danish Center of Education and Research, and in the last few years the classes have been taught at the Chinese Academy of Sciences Teaching Building in the Zhongguancun campus. During this time I have visited several of the restaurants in the area and although these often does not look particularly fancy there are a number of great places to have dinner or grab a quick lunch. Unfortunately, my Chinese is too rusty to decipher the names so I have marked them on the maps below including a picture of the main entrance.
The muslim restaurant serves a variation of tradition Chinese dishes, with an emphasis on lamb, meat skewers, and naturally, no pork. However, this is an amazing restaurant, and probably my favorite spot for lunch near the CAS campus. Here one of the dishes that is an absolute must, is one of the two bread and meat dishes (either meat and bread fried together, or served on top of a round bread looking a bit like a pizza with serious topping). Also, the noodles are very good, which like most places in China are freshly made. However, if this is bought as a shared dish it is worth considering getting the sliced noodle variation over the pulled noodles. Both types are amazing, but as the length of the noodle is an omen for life span the pulled noodles can be somewhat of a challenge to serve with chopsticks.
The Yunnan restaurant serves dishes from the southern parts of China, and this is one of my preferred regions in the Chinese kitchen. Yunnan is a province neighbouring Burma and Laos, which seem to be a large influence on this region. Favouring ingredients like lime, mint, and chilies, the dishes have a lightness compared to many more northern specialties. Any order should include the chicken and lime dish as well as the Yunnan version of a hash browns, both of which are brilliant, and for the more adventurous it is also possible to order roasted bees and larvae. Finally, they also brew a nice lime and mint drink which is not only very good, but also works quite well to quell the heat if you get a bit too much chilli.
On the corner on the other side of Zhongguancun dong lu along the alley towards the Park Plaza hotel there is also a very nice chinese restaurant, that serve traditional dishes like the sweet and sour pork, fried beef and onions in an iron skillet (lower left picture), as well as the pork variation of the Peking Duck (also in the picture).