The 35 kV smart substation, the last link of smart substation, is widely distributed with large number of construction projects, of which the economic operation is very important except for smart, reliable, safe and high efficient operation. However, there is still no design specifications and construction modes for the construction of the smart substation with this voltage level at present. Therefore, a integrated construction mode is presented for 35 kV smart substation, and different construction modes of the smart substation are compared from all aspects.