Two years. Beijing Institute of Technology's counterpart support for Yan 'an University was officially launched in 2009. In the past five years, the two universities have cooperated closely. The exchange between Yan 'an University and Beijing Institute of Technology usually lasts for two years. Focusing on improving the level of teachers, the quality of personnel training, the ability of scientific research service and the management level of colleges and universities, the counterpart support work has been effectively promoted, which has driven Yan' an University to achieve "four remarkable improvements".