China and Belgium should remain committed to keeping their markets open and jointly resist all forms of protectionism, Premier Wen Jiabao said on Thursday during his official visit to Belgium.

The remarks came amid Beijing's efforts to reverse the European Union's decision on Sept 6 to launch an anti-dumping investigation over Chinese solar panels.

The case involves more than $20 billion in Chinese exports, the biggest so far, and constitutes a test of the EU's commitment to free trade.