Regulations Governing Futures Commission Merchants Article 46

In addition to the margins set by the futures exchange in accordance with Article 15, paragraph 1, subparagraph 4 of the Act, a futures commission merchant may collect extra margins depending on a customer's credit condition and the nature of the trades conducted by the customer.When the amount of margins required for the futures trading is adjusted, the futures commission merchant shall notify the futures traders to pay the difference within the time limit prescribed in the brokerage contract.
中文原文 期貨商管理規則第46條
期貨商於期貨交易所依本法第十五條第一項第四款訂定之保證金外,依客戶之信用狀況及其從事之交易性質,得另加收保證金。
期貨交易保證金之額度經調整時,期貨商應通知期貨交易人依受託契約所定期限繳交差額。

English translation for reference only; the Chinese text prevails. Not legal advice.