Abstract: With the rapid development of the radio and television industry, traditional TV signals based on SDI (Serial Digital Interface) baseband signals have been difficult to meet the needs of future technology development and business expansion. Thanks to the rapid development of modern communication technologies and the upcoming 5G era of the Internet of Everything, the radio and television industry will also adopt IP technology to build new network systems. In the transition period to the development of IP, there are still some urgent problems to be solved in the IP of radio and television. In order to solve the problem of requiring high-precision synchronization signals in the radio and television system network to complete time synchronization, this paper adopts PTP (Precision Time Protocol) time synchronization technology to complete time synchronization networking in private Ethernet, set up the test environment and analysis the test data. The test results shows, compared with the traditional NTP (Network Time Protocol) time synchronization technology, the accuracy of the output PTP signal can reach the order of sub-microsecond, which fully meets the high precision requirements of the time synchronization signal of the IP digital TV system in the radio and television industry.