Digital Coincidence counting (DCC) is a very promising, flexible nuclear pulse processing technology. This paper discusses the principle of measurement of 60Co activity by digital coincidence counting method. With the data acquisition and digital coincidence processing software, an experimental system is constructed, and the influence of the threshold on the measuring results is analysed. The results show that the relative error is about 0.44% to referance source. The research shows that the scheme of DCC is really practical, and its algorithms are valid. This study is of ...