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Abstract: We propose a test of the gravitational time dilation in general relativity by long term clock comparison between two stations separated in height. The geopotential difference between the two National time keeping centers in China, Lintong and Beijing is around 4000 geopotential unit, which corresponds to the height difference of 400m. Two clocks and are fixed at stations A and B, respectively, which are synchronized at beginning by a portable clock C in a short time period with go-back synchronization approach. After one month, the clock C is again transported between A and B, comparing the records of the keeping time by clocks and , respectively. Calculations show that, after one month, the difference of the time durations between the clocks and is around 121ns, if general relativity is correct. [Copyright &y& Elsevier]