The end of controls could allow banks to charge lower rates to more credit-worthy borrowers, lowering costs for healthy businesses and spurring growth. Until now, the lower limit on lending rates was set at 0.7 times the state-set benchmark interest rate.
Private sector borrowers also might be able to get more access to credit by paying more. That could help to reduce their reliance on a vast, unregulated underground credit market.
Regulators allowed that market to flourish over the past decade to support entrepreneurs. But they have tightened controls over the past four years since discovering state banks were putting money into such unsupervised lending and taking on unreported risks.
Friday's move could foreshadow another significant change in the world's No. 2 economy raising low rates paid to savers. There was no word on when that might happen.
Beijing has long used its banks to subsidize state industry with low-interest loans. Savers who had few alternative places to put their money were paid low rates on deposits that in recent years failed to keep up with inflation, meaning Chinese families lost money by leaving it in the bank.
That has suppressed household spending, which is among the lowest in the world as a percentage of the economy, and held back efforts to shift the basis of China's growth from exports and investment to more self-sustaining domestic consumption.
Chinese families looking for a better return on their savings have shifted money into more speculative investments in stocks and real estate, helping to fuel a boom in prices of both. They also have shifted money into "wealth management products," bundles of credit card and other debt that pay higher returns but that analysts worry might be too risky for household investors.