BEIJING, Dec. 8 (Xinhua) -- China has witnessed substantial drop of poverty rate in the past 40 years, especially in rural areas, thanks to reform and opening-up, a top poverty alleviation official said Saturday.

The poverty rate, proportion of people living below the Chinese poverty line, had fallen among rural population from 97.5 percent in 1978 to 3.1 percent at the end of 2017, Liu Yongfu, director of the State Council Leading Group Office of Poverty Alleviation and Development told a seminar.

More than 700 million rural residents have been lifted out of poverty over the past 40 years, according to Liu.

It marks a miracle in the history of poverty reduction, Liu said, noting that reform and opening-up is the driving force behind China's success in poverty reduction, while the precise poverty reduction strategy, adopted six years ago, is the correct choice in the new era.

Liu called for consistent efforts in advancing poverty reduction in a more precise and effective way.

The battle against poverty is one of the "three tough battles" that China must win to build a moderately prosperous society in all respects by 2020. To achieve the goal, the country needs to lift around 30 million poor rural residents out of poverty between 2018 and 2020.