"China is embarking on a historic rebalancing of its growth model, and activity is moderating to more sustainable levels," Lagarde said during a visit to Cameroon.
"Nonetheless, this rebalancing is a bumpy process whose effects are being felt worldwide - which reinforces the need for more clarity on policies, especially exchange rate policy," she added.
This week the Chinese central bank guided the yuan currency down, setting its daily fix lower for eight sessions, cutting its value by 1.4 per cent to its lowest level since March 2011, before a slight reversal today.
Analysts have said the Chinese central bank needs to better communicate its intentions concerning the yuan.
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Their handling of the stock market this week also dented confidence in the ability of Chinese officials to manage the economy.
New "circuit breakers" brought into force this week meant to decrease trading volatility backfired.
Trading was halted on Monday and yesterday as share prices plunged the daily maximum of 7 per cent, prompting regulators to rescind the rule.
China is a major consumer of commodities, and its slowing growth has hammered prices of resources, with the price of oil falling by over two thirds in the past year and a half.
While lower prices have been a boon for consumers, they have hurt commodity exporting nations across the globe.
Lagarde said the "fragility" of the global economy would persist in 2016.