ARINC429 bus is a widely used data bus in modern avionics, and its examination plays an integral role in field tests. Field testing will encounter some questions, such as which of the two bus connection ports are positive and whether the running 429 signal is correct. This article completes ARINC429 bus check program on USB429/717 board by using Lab VIEW language. The program can detect the error of bus connection and status, and check its Label, SDI and SSM. The program also searches and analyses the bus data, and preserves the results if necessary. The program is easy to carry and easy to use . Good test results are achieved during on-site operations.