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Objective: By the end of 2020, China has scored a victory in its fight against poverty. Evaluate the poverty reduction effect is not only condutive to issue implementation plans for acceptance of poverty exit, but also of great imprtance to build a long-term and effectual mechanism to solve the relative poverty. Method: By synthesizing an annual dataset of NPP-VIIRS nighttime light (NTL) data from 2014 to 2020, we developed a county-level NTL index to investigate the poverty reduction effects of 831 national-level poverty-stricken counties and 14 concentrated contiguous poverty-stricken areas in China. Result: The results indicated that the economic level of most poverty-stricken counties in China has been improved significantly during the study period, and the poverty reduction effect is prominent. However, there are still 108 poverty-stricken counties with negative growth trend of NTL intensity, which are mainly located at the junction of concentrated and contiguous poverty-stricken areas in the western region. Besides, the NTL intensity development between the north and south parts of western regions is unbalanced. Four NTL development modes, i.e., small NTL base with a rapid growth rate (mode I), large NTL base with a rapid growth rate (mode II)), large NTL base with a slow growth rate (mode III), and small NTL base with a slow growth rate (mode IV) were identified in the 14 concentrated contiguous poverty-stricken areas. It was also interesting to find that the high concentration mode and low restriction mode were distributed at the junction areas among different provincial administrative boundaries. Besides, poor counties along the border are vulnerable to marginalization. Further analysis indicated that significant NTL changes were observed in the poverty-stricken counties with four poverty alleviation paths: infrastructure poverty alleviation, characteristic industry poverty alleviation, asset income poverty alleviation (photovoltaic poverty alleviation) , and relocation poverty alleviation.