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In order to solve the problem of time synchronization among the subsystems in the complex telemetry network system of flight test, this paper discussed the time synchronization concepts between the flight test telemetry network nodes, introduced principle and method of the network time synchronization protocol (NTP) and the precision clock synchronization protocol (PTP) to realize time synchronization among telemetry network test object nodes, proposed the implemention and detection method which based on IEEE 1588 time synchronization protocol of telemetry network, analyzed the main factors which influenced the telemetry network transmission delay and the time synchronization between the test object nodes, and gived the revision. This technique and method can be used for reference for the time synchronization of integrated test network in the future.