The 26-m NanShan Radio Telescope (NSRT) is located at 87°10.67' E and 43°28.27' NB and at elevation of 2080.5m. The overall project to upgrade NSRT started in early 2014 and completed in late 2015. The aperture of the telescope is now 26 meters, one meter larger than the previous one and currently equipped with L-, S/X-, C-, and K-band receivers and a Q-band receiver is on the way. The NSRT backend system is composed of VLBL backend, DFB and continuum backend, which employed to complete the VLBL observations, pulsar and spectral line observations and AGN fux monitoring, respectively.