In view of the influence of the inclination and variable on the pile stability and bearing capacity, this paper introduces particle image velocimetry (PIV) technology, and designs a transparent soil visualization model test. The experimental results show that, when the pile has a variable cross- and inclination angle, the friction resistance on both sides of the pile increases. The vertical-load-carrying capacity of the 2% and 4% inclined piles with a variable cross- is greater than that of the piles with inclinations greater than 8%. For model piles with the degrees of inclination of 2% and 4%, the variable- inclined piles with diameters of 17 mm and 15 mm show significantly less settlement than the equal- inclined piles. For the model pile with an inclination of 8%, the settlement of the inclined piles with a variable cross- diameter of 17 mm is slightly smaller than that of the equal cross- inclined piles. The change in variable cross- and inclination angle has a large effect on the soil displacement around the pile, and the conclusions of this paper can provide guidance for the engineering application of variable cross- piles.