FACTBOX: Key facts on Japan-China trade

(Reuters) - China's President Hu Jintao heads to Japan next week for the first visit by a Chinese president in a decade.

Trade between the two Asian giants has grown steadily, despite tense political relations. Following are some details about the economic relationship between the two.

* ECONOMY

Japan remains the biggest economic power in Asia, with a $4.3 trillion economy in 2006, against China's $2.7 trillion, according to World Bank data.

* TRADE NUMBERS

China replaced the U.S. as Japan's top trade partner in 2007, with two-way trade totaling $236.6 billion, the Japan External Trade Organization (JETRO) reported.

According to Chinese customs authority statistics, Japan was China's third biggest trade partner, behind the European Union and the United States, last year.

* IMPORT/EXPORT

China overtook the United States as Japan's biggest export destination in 2007, for the first time in modern history. Exports to China and Hong Kong combined stood at 17.4 trillion yen ($165.2 billion), compared to 16.9 trillion yen to the United States.