A packet information analysis method suitable for a device measuring and monitoring network traffic in real-time. The method includes: obtaining network data including a combination of multiple network packet header information; generating an index parameter according to packet header information of a monitored network packet in the network packets; querying at least one reference table according to the index parameter to obtain a first reference value and an offset correction value corresponding to the index parameter in the at least one reference table; obtaining a second reference value according to the first reference value and the offset value; and obtaining an evaluation value according to the second reference value. The evaluation value reflects the distribution status of a measuring and monitoring item in the network packets.