Abstract: An investigation on the vegetative growth of man- made forest of young Larix principis-rupprechtii Mayr. Had been carried out from 1980—1983. The result obtained from this investigation on elongation growth of shoot, marphology of radial growth of main stem and roots, and changes in differentiations and structures of various tissue cells as well as the accumulation of dry matter proved that the vegetative growths of various parts mentioned above in this species show significantly seasonal periodicity and previous rhythm of interdependence. The formation of young xylem and bark, and the relationship between it and whole vegetative growth had been analysed. It presents some good idea for high-yield planting and improving traditional forest management according to the rules of growth and development summarized in this paper.