The 1s electron cloud in hydrogen atom has the largest probability density distribution around a spherical shell with Bohr radius a₀. The author thinks the probability density distribution and electron cloud belong in fact, to statistic regularity, and imply a macro-time scale is used, therefore in hydrogen molecule the product of energy and time is far larger than Planck Constant. Based on the overlap of electron cloud, the ground state hydrogen molecule structural parameters are calculated with the classical mechanics, and the hydrogen molecule bond-length R_e, bonding-energy D_e and force constant k are represented R_e = 〓a₀,D_e = ze/4〓a₀,k = ze/2〓 , respectively. When atomic-unit is used, z, e and a₀ are all 1, and there is R_e = 1.414 a. u. , D_e = 0.177 a. u. , k =0.354 a. u. . Compared with experimental values, the respective errors are less than 1 % , 2% and 4% . In this calculation, hydrogen molecule chemical bonding model is concise and has clear physical meaning, and no any artificial parameters are introduced.