Harvest is the key factor driving Changbai Mountain forest landscape changes. This paper used spatially explicit models (LANDIS PRO 7.0) to simulate the longterm dynamic changes of forest above-ground biomass and landscape pattern of Lushuihe Forestry Bureau in Changbai Mountain under five levels of harvest intensity scenarios. The results showed that: 1) harvest led to different degrees of fragmentation of tree species; 2) harvest intensity had a significant effect on forest above-ground biomass. With the increase of the harvest intensity, the above-ground biomass decreased. Harvest also significantly reduced above-ground biomass of different tree species. Moreover, harvest had a greater effect on Fraxinus mandshurica, Picea koraiensis, and Tilia amurensis. Therefore, in the early simulation period (2003-2103), when a higher harvest intensity was carried out, Betula platyphylla and Populus davidiana could be harvested firstly, followed by F. mandshurica, P. koraiensis, and T. amurensis. When a lower harvest intensity was performed, tree species
 of B. platyphylla, P. davidiana, F. mandshurica, P. koraiensis, and T. amurensis could be harvested equally. In the late simulation period (2103-2203), harvest intensity should be reduced because forest aboveground biomass showed a trend of decrease, and B. platyphylla, P. davidiana, F. mandshurica, P. koraiensis and T. amurensis can also be harvested equally. The harvest strategies can provide help for the forest administrative department to develop reasonable measures.