The IMF report comes a day after regulators in Beijing drafted new rules to strengthen bank funding, and follows a number of alerts about a ballooning debt problem in the world's number-two economy.
Near the top of the list in the IMF study on the stability of China's financial system is the need for banks to increase their capital to ward off risks from mounting debt.
China has largely relied on debt-fuelled investment and exports to drive its tremendous economic growth, but the Fund said this model has reached its limits.
"We recommend the authorities to de-emphasise the GDP (growth)," Ratna Sahay, deputy director of the IMF's Monetary and Capital Markets Department, said during a news conference.
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China should "incite local governments to strengthen supervision on risks", she added.
Abundant credit allows local governments to hit high growth figures but now each extra dollar of debt is producing diminishing returns.
The ballooning debt -- estimated at 234 percent of gross domestic product by the IMF -- adds financial risk and may weigh on China's future economic growth.
The Fund's experts carried out stress tests on dozens of banks.
China's big four banks had adequate capital but "large, medium, and city-commercial banks appear vulnerable", the IMF said.
It added that 27 out of the 33 banks tested -- accounting for three-quarters of China's banking system assets -- were "undercapitalised relative to at least one of the minimum requirements".
While the country's banking system meets the requirements of global banking rules known as Basel III, "current circumstances warrant a targeted increase in capital", the report said.
China's central bank said it disagreed with "a few descriptions and views" in the report.