Abnormal fund analysis method and system based on bill transaction records

The invention discloses an abnormal fund analysis method and system based on bill transaction records, and the method comprises the steps: extracting conventional fund transaction records in income/expenditure bill transaction data through a fixed threshold method, and calculating a monthly conventional average value of the conventional fund transaction records; calculating a single capital average value and a monthly average value of the income/expenditure bill transaction data, and correspondingly comparing the single capital average value with the monthly average value to obtain capital critical values of the income/expenditure bill transaction data, the capital critical values including a maximum upper limit value and a minimum lower limit value; and in response to the fact that the monthly conventional average value is smaller than the maximum upper limit value and larger than or equal to the minimum lower limit value, determining the monthly conventional average value as an abnormal fund judgment value