China's GDP grew by 5.5 percent year-on-year in the first half of the year to 59.3 trillion yuan ($8.3 trillion), posting a steady economic rebound, the National Bureau of Statistics said on Monday.

In the second quarter, the economy rose by 6.3 percent compared with a year earlier, up from 4.5 percent in the first quarter of the year. On a quarter-on-quarter basis, China's GDP increased by 0.8 percent in the second quarter of the year, the NBS said.

Figures released by the NBS showed China's value-added industrial output, a gauge of activity in the manufacturing, mining and utilities sectors, grew by 4.4 percent in June from a year earlier after a 3.5 percent rise in May.

In the first half of the year, value-added industrial output grew by 3.8 percent compared to the same period last year, while in the first quarter, it rose by 3 percent from a year earlier.