Abstract: The specific heat capacity is a fundamental thermal property of soils, which has been widely determined by the dual-probe heat pulse method. The pilot holes are crucial for the heat pulse measurement of specific heat capacity of soils, necessitating that each individual hole should be perfectly vertical and strict coplanar parallelism between two holes. However, the traditional space-fixed borehole approach is compromised by penetration resistance of soils, failing to fulfill the above requirements and thus affecting the measuring stability. An innovative holes-assembling approach is proposed, specially designed to accommodate the dimensions and shapes of heat pulse probes. By employing the custom-designed forming dies, a pair of parallel semi-circular holes is created in two soil blocks under static pressure, followed by symmetrically block-assembling to achieve the necessary coplanar parallel vertical double circular holes. The results indicate that holes-assembling approach can significantly enhance the stability of the dual-probe heat pulse method in measuring the specific heat capacity of soils compared to the conventional space-fixed borehole method. Moreover, the test outcomes through the holes-assembling approach align closely with those obtained by the DSC and TPS methods, signifying that the modified dual-probe heat pulse method can more accurately determine the specific heat capacity of soils.