Official data showed the Chinese economy maintained 7 percent growth in the first half of 2015 against challenges at home and abroad, creating sound conditions for the yuan to hold steady.

Surplus in goods trade reached $305.2 billion in the first 7 months, a fundamental prop for the exchange rate.

An internationalized yuan and open financial sector have boosted the demand for the currency in recent years, which serves as momentum for the rate's stabilization, the PBOC said.

In addition, the PBOC also cited China's abundant foreign exchange reserves, stable fiscal condition and healthy financial system.

The central parity rate is based on a weighted average of prices offered by market makers before the opening of the interbank market each trading day. The currency is allowed to trade on the spot market within 2 percent of the rate.

The PBOC said it will strive to further improve market-based exchange rate formation, maintain normal fluctuations and keep the rate basically stable at an adaptive and equilibrium level.