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According to the test data of a highly abnormal action occurs in the process of radar altimetertest, used fault tree analysis method for troubleshooting of radar altimeter and test equipment. There were dozens of frame data error when the serial port communication card of the host computer to receive the data of the lower machine each test. After testing found that the data signal from the lower machine had certain distortion,the adaptability of the serial controller chip OX16PCI694 used in the serial communication card of the host computer was insufficient. Lead to the received data frame CRC check digit mistakes, then the application discarded the data frame for receiving frame error. Defects exist in robust design of the application, which dependented on data frames as reference time, but discarded data frame without the relevant treatment. Increased the fault tolerance design of the host computer software, Increased frame number in protocol data from the lower machine. Communication card was designed perfect by using the serial controller chip 16C554 with good compatibility. After the hardware and software design improvements, the problem is resolved in the test.