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Multiphase flows are very important in industrial application. In present study, the force schemes in the pseudopotential LBM for two-phase flows have been compared in detail and the force schemes include Shan-Chen, EDM, MED, and Guo's schemes. Numerical simulations confirm that all four schemes are consistent with the Laplace law. For Shan-Chen scheme, the smaller is, the smaller the surface tension is. However, for other schemes, has no effect on surface tension. When 0.6 < ≤ 1, the achieved density ratio will reduce as reduces. During this range of , the maximum density ratio of EDM scheme will be greater than that of other schemes. For a constant , the curves of the maximum spurious currents ( ) has a minimum value which is corresponding to except for EDM schemes. In the region of < ≤ 1, will reduce as decreases. On the other hand, in the area of ≤ , will increase as decreases. However, for EDM scheme, will increase as increases.