Abstract:Genetic parameter estimation is one of the most important steps in treebreeding.Tree clonal breeding has many advantages,of which fare mainlysimple in breeding method,short breeding circle and high gain.But it larchsa good set of methods in genetic parameter estimation.At present,the estimating genetic parameters in clonal breeding of forest trees nearly all adoptthe methods used in sexual breeding,which is likely to affect precise estimation of genetic parameters.This paper presents a precise fomula of geneticparameter estimation for clonal breeding after an investigation on clonal materials.A discussion was also made on the number of clones used in the establishment of plantations.