The invention relates to an acaricide composition and the effective ingredient of the acaricide composition comprises tebufenpyrad and fenbutatin oxide in a mass ratio of 50:1 to 1:80.

Through model tests, it has been found that the effective mass coefficient for the soil is around 0.2 for artificial islands with height-to-diameter ratio being smaller than 1/3.

For example saturation density, bulk binding energy, symmetry energy coefficient, incompressibility, and the ratio of effective nucleon mass to free nucleon mass at the saturation density.