In emulsified oil

flexing oscillation of latex particle happens in the pulse electric field.The exact solution of the force acting on latex particle by oil is not clear yet.By establishing a model of single particle’s flexing and deformation in oil

the velocity potential of the liquid inside the particle was obtained.The flow function of the liquid outside the particle was derived from the ellipsoid harmonics function.In the course of latex particle’s deformation

the force produced by the oil around was calculated at the instant of deformation with the theory of Stokes flow.The results of numerical calculation showed that at a small deformation of particle

the force coefficients agreed well with the calculation based on the assumption of linear distribution of particle’s deformation.When the length of particle’s long axis was greater than three times of short axis

the force coefficient tended to a minimal value

close to zero.So the force on deforming latex particle by oil at an arbitrary moment could be solved with the exact expression.