Using the shape anisotropy and magnetic field orientation changes, we realized the chirality and polarity controllable artificial skyrmion through the micromagnetic simulation software OOMMF. Combining the CoPt film with perpendicular magnetic anisotropy, and our self-designed Co nanodot pairs structure carrying magnetic vortex with controlled chirality and polarity, skyrmion states could be achieved by adding the external magnetic field. Single skyrmion state can be formed when 200 mT in-plane magnetic field is introduced; while the magnetic field intensity is reduced to 140 mT, double skyrmions state can be formed. The detail forming process of skyrmion is studied by studying the key nodes in the saturation magnetization and demagnetization process. It is also found that the polarity of skyrmion is stable even under the action of the 0.6 T out-of-plane magnetic field. By comparing the influence of Co disk thickness on the formation of skyrmion, it is found that 45 ∼ 60 nm Co disk thickness is suitable for forming stable skyrmion.