Abstract: In order to study the influence of experimental parameters, such as mixing time, coal sample particle size, water injection rate and injection pressure difference on the soaking of coal particles in the process of water injection and choose the best experimental parameters for the experiment, this article studied the soaking effect of coal particles of the experimental parameters under different mixing time, particle size, water injection rate and injection pressure difference used the 8^#coal sample in Wolonghu Coal Mine in the injection desorption research experiment instruction developed by our own laboratory. The result shows that different water injection parameters have a great influence on the soaking of coal particles, and the soaking effect of coal particles is best when the stirring time is 1.25 h, coal size is 1 to 3 mm, the injection pressure difference is 1 MPa and the injection rate is 1 mL/min.