In this paper, the principles of TCN are briefly introduced. Based on existing applications, it describes the present field of burial age, erosion rate and faultslip rate for the glacier, fault slip and terrace, etc..Current research work and problems in several specific earth science areas including glacial geomorphology, tectonic geomorphology, geomorphologic processes and geomorphic evolution are also summarized. In addition, the problem not resolved yet is described, such as the relationship of radionuclide generation rate with time and space, uncertainty of results from geological and geomorphological conditions of sample.