China is expected to surpass the United States this year to become the world's largest market for express deliveries, but analysts warned of rapid development that ignores quality.

Ma Junsheng, director-general of the State Post Bureau of China, said at an internal conference on July 18 that China's postal industry maintained fast, steady development in the first half. Ma attributed the trend to national economic policies and booming e-commerce.

Express delivery volumes grew more than 50 percent year-on-year in each of the past 28 months, the bureau said.