This study mainly applies DEA(Data Envelopment Analysis) to evaluate the Malmquist productivity index - effch, techch, pech, sech and tfpch of four listed mobile telecommunications companies in Taiwan in 2013-2017. The average value of the whole period is 0.98694, 1.00325, 1.0000, 0.98694 and 0.99113. During the estimation period, the evaluated Taiwan-listed mobile telecommunications company had a -0.89% decline in productivity. The regression analysis pointed out that the productivity of Taiwan-listed mobile telecommunications companies was significantly negatively correlated with the number of directors, that is, the increase in the number of directors and supervisors, the efficiency of pech will decline.