Legal analysis: if the amount of credit card fraud is more than 3,000 yuan to 10000 yuan, more than 30,000 yuan to 100000 yuan and more than 500,000 yuan, it should be recognized as "large amount", "huge amount" and "extremely large amount" respectively, which meets the criteria for filing fraud, and the public security organ should file a case.

Legal basis: Article 266 of the Criminal Law of People's Republic of China (PRC) defrauds public or private property, and if the amount is relatively large, he shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.