China's investment in the treasury bonds of the United States is a market behavior, and should not be politicized, Yi Gang, director of the State Administration of Foreign Exchange, said Tuesday.

The U.S. treasury bond market is an important market for China while both buying and selling of the bonds are normal, Yi, also vice governor of the People's Bank of China, the central bank, said on the sidelines of the annual session of the National People's Congress, the supreme legislature.

"China is a responsible investor and the investment will be mutually beneficial," Yi said.

According to the U.S. Treasury Department, at the end of last year, China held 894.8 billion U.S. dollars of U.S. treasury bonds. The figure, revised up from the previous 755.4 billion U.S. dollars, making China the largest overseas holder of U.S. treasury bonds.