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Flying time sequence of launch vehicle is a series of instruction parameters output. The measurement of its output precision is an important basis to judge the flight of rocket. In view of output link of launch vehicle 's flying time sequence is complex and test interpretation is various, the principle of output flying time sequence is characterized firstly. Then according to the method of ground test and remote test of the time sequence, the source of test error from the whole link is analyzed. The source of ground test error is mainly from software cycle. While the source of remote test error is mainly from coding and sampling error,and the receiving error of take-off signal.Lastly, through the test data from one task of some rocket, the analysis of the test error is verified. Several approaches of improving the level of time sequence output precision and reducing the test error is put away.