To understand the nature of two poles for the varLambda (1405) state, we revisit the interactions of {bar{K}}N and pi Sigma with their coupled channels, where two-pole structure is found in the second Riemann sheet. We also dynamically generate two poles in the single channel interaction of {bar{K}}N and pi Sigma , respectively. Moreover, we make a further study of two poles’ properties by evaluating the couplings, the compositeness, the wave functions, and the radii for the interactions of four coupled channels, two coupled channels and the single channel. Our results show that the nature of two poles is unique. The higher-mass pole is a pure {bar{K}} N molecule, and the lower-mass one is a composite state of mainly pi Sigma with tiny component {bar{K}} N. From our results, one can conclude that the varLambda (1405) state may be overlapped with two different states of the same quantum numbers.