Net income declined to 1.45 billion yuan from 1.97 billion yuan, the Shanghai-based automaker said in a statement to the city's stock exchange on August 27. Sales rose 6.9 percent to 61.6 billion yuan.

The automaker booked write-offs after Korean unit Ssangyong Motor Co entered receivership on tumbling sales of sport-utility vehicles. The loss eroded the benefit of a 24 percent surge in vehicles sales caused by Chinese tax cuts, government subsidies and economic growth.

"Ssangyong has continually weighed on earnings," Yu Bing, an analyst at Ping An Securities Co in Shanghai, said before the announcement. The domestic sales "momentum should continue in the second half", Yu said.

SAIC climbed 8.6 percent to 18.66 yuan in Shanghai trading before the announcement. The stock has more than tripled this year, compared with a 63 percent increase for the benchmark Shanghai Composite Index.

SAIC sold 1.23 million vehicles in the first half, giving it a 20 percent market share, the company said. Chairman Hu Maoyuan has said full-year sales may reach 2 million, up from 1.8 million last year.

Overall Chinese vehicle sales rose 31 percent to 5.37 million in the first seven months of the year. The full-year tally may rise 20 percent to 11.5 million, SAIC said. China has surpassed the US as the world's largest automobile market this year.