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In construction work uses various types of heavy equipment to make road construction and maintenance, one of which is Cold Milling Machine. The use of cold milling machine is influenced by the operator efficiency factor in its operation and will have an impact on the productivity of the machine. The purpose of this study was to determine the productivity ratio between old and new operators and the number of efficiency factors for cold milling machine operators. The variable reviewed is the result of excavation from the cold milling machine operated by the operator. The research method used is direct observation in the field then the data is processed using t-test analysis. The results of this study are there are differences in skills between operator A and operator B based on the results of the t value (2.846> 1.812) greater than t table. The result of the calculation of the efficiency factor of cold milling machine operators is that by using a comparison of theoretical and actual productivity, it gets a very good category with a value of 0.84 for old operators and for new operators obtains a value of 0.48 which is categorized as less.