Abstract: Oriented with the national policies on popularizing and applying new energy buses, the national new energy buses developing scale in 2020 was forecasted, and the energy-saving and emission-reduction effect of new energy buses during "the 13^th five years" was evaluated. Firstly, according to the developing trend of the quantity of people and the urbanization, combined with the increasing trend of buses, the developing scale of buses was forecasted as 700 thousand till 2020. Then, based on the policies orientation on popularizing and applying new energy buses, and according to the developing target in the policies of popularizing and applying new energy buses, the developing scale of new energy buses was obtained as 220 thousand in 2020. Finally, LEAP model was used to calculate the energy-saving and emission-reduction results of new energy buses. For the whole "13^th five years", the new energy buses will save standard coal for 5.93 million ton and reduce carbon emission for 12.5 million ton. It is apparent that the effects of energy-saving and emissionreduction are quite significant.