Whether the current account surplus or the asset finance account surplus is reflected in the balance of payments, it is the lender; Accordingly, reserve assets should be positive debits, mainly manifested in the increase of foreign exchange assets. For countries with fixed exchange rate system, while increasing foreign exchange reserves, the central bank needs to issue the same amount of local currency according to the exchange rate, which leads to the increase of base currency, that is, the increase of money supply.

That's what I understand ~