In 1966, Shanghai Mini-Auto Works introduced its second mini-car, the four-seater Haiyan SW710. The engine was based on the BMW M403 Isetta engine. About 100 cars were produced, 51 of them for the Shanghai Taxi Company.
The car had a wheelbase of 1820 mm, dimensions of 2940 x 1430 x 1360 mm (L x W x H) and weighed 560 kg. The 1-cylinder 298cc engine produced 13 hp (10 kW). The car was fitted with 4.00×12 tyres and had a top speed of 60 km/h.