There is developed transportation network near RUC. As for Bus, there are Renmin Daxue station out of east gate and Wanquanzhuang station out of west gate; if you want to take the subway, there is Renmindaxue Station on Line 4 (east gate), and Suzhoujie station on Line 10 (west gate). Of course, you can also take the taxi ¨C the price start at 10 yuan, and 2 yuan for every kilometers if your journey is more than 3 kilometers. When taking a taxi, please remind the driver to turn on the meter and make sure that you have the receipt.
As for detailed travelling route, you can search online.
Baidu Map: http://map.baidu.com/
Sogou Map: http://map.sogou.com/
Campus map of Renmin University click to check
The location of RUC in Beijing Subway click to check