[Purposes] This work aims to solve the deformation incoordination problem caused by the large modulus difference between the built?in sensing device and the asphalt pavement material, an integrated design method of the built?in sensing device and the asphalt pavement considering synergistic deformation enhancement was proposed. [Methods] Taking the embedded asphalt strain gauge as an example, the ABAQUS software was used to establish an asphalt mixture structure model with built?in sensors. Through numerical simulation and calculation, the stress difference rate of 10.0% was taken as the evaluation index, and the stress influence range of the built?in sensor was established as the modulus transition area. The modulus transition zone was made by epoxy resin material and its mechanical properties were tested and evaluated. Using digital image correlation (DIC) technology, the mechanical response tests of asphalt mixture specimens with built?in sensing devices under uniaxial compression and four?point bending loading were carried out. By comparing the difference between the measured response of the sensor and the measurement results of the DIC method, the effectiveness of the modulus transition zone on the synergistic deformation enhancement of the sensor and the asphalt pavement was analyzed. [Findings] The results showed that the built?in sensor would change the stress distribution of the asphalt mixture structure. The influence range of the sensor in the vertical, horizontal and vertical directions was 58 mm×199 mm×82 mm. The modulus transition zone of the epoxy resin material had good mechanical properties, and its elastic modulus was 2.5 times that of the asphalt mixture, which can form an effective modulus transition between the asphalt mixture and the sensing device. Under step?wise compressive and flexural?tensile loading, the strain difference of the specimen measured by the transducer was reduced by 66.6% and 65.9% respectively by setting the modulus transition zone, which indicates that the stability and effectiveness of the measured response of the built?in sensing device could be significantly improved by setting the modulus transition zone. [Conclusions] Setting modulus transition zone between asphalt mixture and sensing device to form modulus gradient transition structure is an effective means to enhance the synergistic deformation of the two. In practical engineering applications, the integrated design process of collaborative deformation enhancement mainly includes the determination of modulus transition zone range, material selection and performance evaluation, and verification of collaborative deformation effectiveness.