In order to carry out the concept of harmonious coexistence between man and nature, a multi-level national green development evaluation index system referenced to the relevant data of the provinces and a measurable model were constructed, and the green development level of each province in China was measured as an example. Meanwhile, the distribution and form characteristics and the regional differences between the green development levels of each province were estimated and analyzed through the nuclear density function and dagum Gini coefficient. The results indicate that some provinces and cities in China are concentrated at the backward level in the green development level and its sub-evaluation dimension, and a few first-line provinces and cities are developed; The largest contribution rate of regional differences is the main causation of regional differences, the comprehensive evaluation score of green development level in the whole country and the eastern region is σ-convergent, while there is no σ-convergence in the central and western region; The green development level of the whole country and the three parts of the east, central and western China is β-convergent and converges at the same steady-state level respectively.