The invention relates to a master clock test method based on a network communication distributed precise time synchronous protocol. The method comprises a comparison algorithm for a data set, and an algorithm for calculating each related port state, wherein consistency sub tests for the DSC (Data Set Comparison) algorithm and and the SD (State Decision) algorithm comprise the following sub tests: DSC algorithm test based on Grandmaster Priority 1 characteristic value and the like, test on the II part of data set comparison algorithm DSC, test on a state decision algorithm of which the DUT (Device Under Test) clock level is less than 128, and test on a state decision algorithm of which the DUT (Device Under Test) clock level is more than or equal to 128. The invention provides a series of test methods for a BMC algorithm in an actual device. The test methods are used for identifying whether a BMC(Best Master Clock) algorithm accords with a 1588 protocol standard or not. Therefore, the compatibility and the interoperability between different equipment in a 1588 system are improved, and an unexpected behavior caused by lack of standardization of the BMC algorithm is avoided in a synchronizing process.