With the popularization and application of synchronous phasor measurement unit (PMU) in the distribution network, the challenges in communication and timing are gradually emerging. In the aspect of time service, the cost of Beidou / GPS is high, and it is difficult to install in some occasions. In the aspect of communication, the stability of 4G is relatively poor and the investment cost of optical fiber is high. In this paper, PMU based on 5G is tested in laboratory environment, field test environment and demonstration project. In terms of time synchronization, pulse per second of 5G and standard clock source are compared and tested. The test results show that the errors are all within 300 ns, which meets the requirements of PMU device for time accuracy of one microsecond. In the aspect of communication delay, the test results show that the maximum bidirectional delay from PMU to main station is less than 14 ms, which can meet the higher requirements of PMU for communication delay. In terms of bandwidth, 5G can still meet the requirements of PMU for reliability and bandwidth under the limit condition that the program does not make any restrictions. 5G’s superior communication performances includes short delay, high reliability, high precision timing, high bandwidth, etc.are verified through the tests, which will provide communication and timing basis for the application of PMU in new power grid scenarios.