The 10-machine 39-bus power system is a simplified model of the high voltage transmission system in the northeast of the U.S.A. (New England area). It was presented for the first time in 1970 and has since been often used for scientific research and publications. The 10-machine 39-bus power system consists of 39 buses, 10 generators, 19 loads, 34 lines and 12 transformers. This text describes the model of the 10-machine 39-bus power system and its parameters. In addition, the synchronous generator model and GFM converter model in related paper are also presented.