By using the transparent soil materials and the Matlab image processing technology, a model experiment of high-pressure jet remediation agent transport in transparent soil was done to obtain the migration process of agents visually and non-intrusively. For studying the migration characteristics under the different void ratios, particle size distributions, and osmotic pressure differences, the model tests were conducted and the comparison of migration rate and distribution area was made. The results show that the migration rate decreases with the decrease of large particle size content, void ratio and osmotic pressure difference, and there is a similar quadratic function relationship between the factors and migration rate; the distribution area of agents enlarges with time elapsed, and the period of agent migration can be divided into two stages, i.e. rapid growth stage and slow growth stage.