Exhibit 8.1

List of Principal Subsidiaries, the Variable Interest Entity and the Subsidiaries of the Variable Interest Entity

Subsidiaries

  ​ ​ ​

Place of Incorporation

Niu Technologies Group Limited

Hong Kong

Beijing Niudian Information Technology Co., Ltd.

Mainland China

Niu Innovation Technology Ltd

British Virgin Islands

Niu Technologies Europe AG

Switzerland

Niu Technologies Germany GmbH

Germany

Niu Technologies Italy S.R.L.

Italy

Variable Interest Entity

  ​ ​ ​

Place of Incorporation

Beijing Niudian Technology Co., Ltd.

Mainland China

Subsidiaries of the Variable Interest Entity

  ​ ​ ​

Place of Incorporation

Jiangsu Xiaoniu Diandong Technology Co., Ltd.

Mainland China

Shanghai Xiaoniu Internet Technology Co., Ltd.

Mainland China

Changzhou Niudian International Trading Technology Co., Ltd.

Mainland China