UDP(User Datagram Protocol)does not adopt retransmission mechanism.Packet loss may happen when poor contact or electromagnetic interference occurs,which can affect the link.Quick analysis for a single data file is achieved by using the Wireshark's built-in statistical and ranking functions.Based on the ranking idea,Auto-Array method,which adopts a software algorithm,is further studied.Tests and comparisons show that Auto-Array method can provide quick analysis for multiple data files.Details of the packet loss in UDP data files can also be output.The method can provide criteria for evaluating the reliability of UDP transmission.