摘　要: 银行卡在信息时代发挥着重要的作用，但由于存在信息保护和业务处理方面的漏洞，已被犯罪分子充分利用，给银行和持卡人带来了巨大的经济损失。用变形字符表示卡的特征值、结合卡号和密码检验能实现银行卡的多维防伪，杜绝他人成功伪造银行卡，对国家、银行和持卡人来说都具有十分重要的意义。 Abstract:：The Bank card produces a marked effect in information age. It easy be used by lawless person that message saveing and deal processing has defects. So Banks and holders of card suffers a great economics loss. To express eigenvalue of card by changed chars, combining card No and password check can achieves card preventing to forge in many ways. This can prevent man to successfully forge Bank card . This is very important for country, Bank and holder of card. Key words: Bank card; preventing to forge ; preventing to forge in many ways