China National Heavy-Duty Truck Group Co, the nation's largest heavy-duty truck maker, reported robust profit growth in the first half of this year despite shrinking domestic and overseas demand.

First-half profit of the Shandong-based company, also known as Sinotruk, increased 27.5 percent from the same period last year, according to its interim reports issued on August 27.

It has secured export orders for more than 14,000 heavy trucks, making it the largest exporter of the vehicles in the country for eight years in a row.