legal ground
Article 178 of the Company Law of People's Republic of China (PRC)
When a limited liability company increases its registered capital, the contribution of the newly-increased capital subscribed by shareholders shall be implemented in accordance with the relevant provisions of this Law on the contribution of limited liability companies.
When a joint stock limited company issues new shares to increase its registered capital, shareholders shall subscribe for new shares in accordance with the relevant provisions of this Law on the establishment of a joint stock limited company and the payment of shares.