A senior official has said that China's family planning policy should be unswervingly adhered to.

The policy should be long-term and its primary goal is to maintain a low birthrate, said Wang Xia, Minister of the National Population and Family Planning Commission, at a national conference on January 14.

The authorities will expand pre-pregnancy check services to reach all county-level areas across the country and ensure migrants' equal access to related public services this year, according to Wang.

At present, such services are available in about 60 percent of county-level areas in the country, covering more than 80 percent of the target population.

Wang also pledged that efforts should be made to rectify the imbalance in gender ratio.