The translocation of polymer chains through a small hole was simulated with the dynamic Monte Carlo method. The dependence of the relaxation time (tau(1)) and escaping time (tau(2)) on the chain concentration (C) was studied. The interchain interaction played an important role in the translocation process. Different behaviors were discovered at low and high C regions. tau(1) presented a power law behavior with C at low and high C values with exponents of -1 and -3, respectively. tau(2) was roughly independent of C at low C values but decreased with power law exponent -1.3 at high C values. (c) 2006 Wiley Periodicals, Inc.