50 % of the original peatland area of Finland has been drained for forestry. This had an immense degrading impact on the natural values of mires. Peatland restoration has been found as an effective way to regain these values. More than 25 000 hectares of different types of peatlands has been restored since the beginning of the 1990´s. In restoration the mire must become more permanently waterlogged again. This is best achieved by completely filling in ditches and by removing trees. The results of restoration are evaluated by different monitoring methods.