The figure given in a working paper from the People's Bank of China is slightly lower than its forecast of 6.9-percent expansion for the current year, the official Xinhua news agency reported.
The paper listed overcapacity, profit deceleration and rising non-performing loans as major drags on the economy.
But it said a recovering property market, the lagging effects of macro and structural policies and small improvements in overseas demand would help bolster growth.
The central bank has cut interest rates six times since November 2014 and reduced banks' reserve requirement ratio several times to try to stimulate growth.
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Authorities say growth will slow as the economy transitions from reliance on investment and exports towards consumption.
President Xi Jinping said in November that annual expansion of only 6.5 percent would be enough to meet national goals.
The central bank paper tipped export growth of 3.1 percent in 2016 while imports were expected to rise 2.3 percent.
But the Chinese Academy of Social Sciences, in a report quoted by Xinhua, highlighted uncertainties both at home and abroad and urged the government to maintain an easy monetary policy.