They brought together decades-long research results on 50-odd timber and fruit species and mapped out hundreds of mathematical models that help appreciate the productivity of each species in any land and age.

They established a practical method for classification of forest land types and drew up a forest land type classification map on the vast area of forests.

On this basis, they developed an aid system which helps turn all the mountains of the country into useful ones and appreciate their prospective economic effectiveness.

The development of this system provides a guarantee for planting and cultivating tree species with high economic effectiveness according to regional conditions and characters.

They are now intensifying the work to update the system.