Abstract: In order to support integrated application of Beidou intelligent monitoring terminal and auxiliary driving system, aiming at diversity of agricultural Beidou terminal products on market and significant difference in operation effects, comparative test of straightness accuracy of tractor Beidou terminal and ridging industry straightness accuracy of three products was carried out with reference to promotion and appraisal program．Test results showed that selected three prototypes could reach qualified level under different operating speeds and land conditions, but operating effects were significantly different．Straightness accuracy was positively correlated with operation speed, and straightness accuracy increased with increase of operation speed．Comparison test could provide a reference for revision of qualification outline．