Top leaders will gather at the Fourth Plenum in Beijing from October 20 to 23, state news agency Xinhua reported.

The Party's top brass is set to deliberate the country's 15th Five-Year Plan, which will set overarching policy goals for the half-decade starting next year.

China has battled sluggish economic growth, high youth unemployment and dwindling birth rates since the start of the ongoing 14th Five-Year Plan.

President Xi Jinping said in April that in the next five years, China should place equal emphasis on development and security, "with a comprehensive assessment of domestic and external risks and challenges", according to remarks previously published by Xinhua.

The new plan "must focus on the goal of basically realising socialist modernisation, with a view to building a great country and advancing national rejuvenation", Xi said at the time, according to Xinhua.

A years-long debt crisis in the property sector, persistent sluggishness in domestic spending and heightened trade tensions with Washington are among the thorny issues facing Chinese leaders.

Youth unemployment hit a record high of 21 percent in August since publication of the statistic resumed under a revised calculation method last year.

And factory output and retail sales rose last month at their slowest pace in around a year, according to official data.