The embodiment of the invention relates to recharging methods and a recharging system, wherein one of the recharging methods comprises the following steps: a recharging request message sent by a mobile terminal is received; according to an obtained rechargeable card mark, whether relevant information of set failure of a rechargeable card corresponding to the mobile terminal is stored is judged; if the information is stored, the message of an invalid rechargeable card is returned. The other recharging method comprises the following steps: according to the received status of a rechargeable card, a rechargeable card mark carried in a request message is queried, and the status of the rechargeable card is also queried; when the status of the rechargeable card is valid, whether the rechargeable card is bound with the numbers of other mobile terminals is judged; if the judgment is YES, the locked rechargeable card status response message of the rechargeable card is returned. The embodiment of the methods and the system can prevent repeated recharging of a rechargeable card by different mobile terminals, thereby ensuring that one rechargeable card can only be used for recharging for just one time.