In the vast majority of cross-border telecom fraud cases, the illegal money is usually taken out through overseas ATM machines, and a series of fund transfer behaviors will occur overseas after the illegal money is taken out, which is not controlled by the mainland police. Because the Chinese mainland police can only find out the financial transactions generated by the "head account" opened by criminal suspects using the identity information of Chinese mainland residents. In order to find out the transfer and dispersion of follow-up funds abroad, we must rely on the in-depth cooperation of overseas police to effectively find out the whereabouts of stolen funds. However, it is still difficult for overseas police to find out where the stolen money is. This is because there are many links and participants in this kind of crime. After the money is distributed to many people involved in the case, it is a very complicated job to find out the transfer direction of the stolen money of the corresponding people involved. In addition, a large part of the money transferred to criminal leaders will go through "underground money houses" and "bleaching", which makes it difficult for overseas police to find out the flow of the funds involved after they are transferred abroad.