WASHINGTON, March 16 (Reuters) - U.S. Treasury Secretary Timothy Geithner said on Tuesday he thinks China eventually will decide it needs to adopt a flexible currency exchange rate policy.

It's an important issue for China, for all China's trading partners, and I'll say as I've said before, I think China will decide ultimately it's in their interest to move, Geithner said in an interview on Fox Business Television.

I think ultimately they're going to decide over time it's in their interest to move to a more flexible exchange rate, he added.

(Reporting by Glenn Somerville and Lesley Wroughton)