By considering channel characters and thermal distribution of the totational levels, experimen-tally determined absolute photoabsorption spectrum of molecular hydrogen have been analysed: these vibronic oscillator strengths in the region of 11.0—15.0 eV are determined, the total photodisso-ciation of B′1Σ+u is also obtained. Meanwhile, the photoabsorption spectrum in the valence and continuum regions (11.0—19.0 eV) of molecular hydrogen has been calculated based on multi-scattering self-consistent field. The theoretical calculations are in good agreement with experimental results.