Abstract: As a main analytical method of HWD test data of airport road surface, there exist many forms of deflection basin area index in and abroad because of various amount of sensors and different space arrangements. But there is almost none analysis about the reliability and application scope of these formulae. Based on the theory of elastic substrate, five deflection basin area indices are analyzed and compared with calculation results of 99 instances.Analyses show that remote sensors are better choice and the more of them, more accurate the data will be. Based on the above analyses, error ranges of the current five deflection basin area index methods are obtained. Finally,the area index method of deflection basin with 6 outer deflection schemes is proposed with larger analyzing results than actual values, and the limit analyzing error can be limited below 10.47%.

Key words: deflection basin area index method, remote sensor, HWD deflection