Abstract: In the joint application of transparent soil testing technology and digital image correlation technology, the quality stability of speckle pattern directly determines image acquisition and measurement accuracy. The High Contrast Particle Staining (HCPS) method was proposed for the stable high-quality transparent soil speckle patterns, which was evaluated by MIG and zero-displacement test to determine the optimal configuration ratio of speckles. Through the transparent model test of rectangular pipe-jacking to verify its application effects, the internal evolution process of surface deformation law and back-soil effect was elaborated by using displacement nephogram, vector diagram and curve combined with field monitoring data. The results show that: (1) The optimal staining agents for transparent soil is black water-based chromatin solution and white water-based matte paint, and the optimal configuration ratio B:W is 8:10. At this time, the MIG is the highest, the strain nephogram is flat and has the least identification error of speckle over-range. (2) The results of transparent soil model test and field monitoring data jointly revealed the occurrence of back-soil effect of rectangular pipe-jacking. It includes subside area, compensation area and uplift area gradually appearing along the jacking direction, and the occurrence of back-soil effect is continuous in long-distance projects. (3) The uplift of subside area and compensation area is caused by jacking pressure, which of uplift area is the influence of jacking pressure and pipe-soil friction. The regional uplift deformation caused by pipe-soil friction is twice than that caused by jacking pressure. (4) HCPS method avoids the problems of overexposure, distortion, interference, and lack of information, achieving good experimental application effect.