Free radical telomerization is studied by Monte Carlo method. In telomerization, generalized rate constants for growing radical chain do not reflect accurately because chains less than five monomer units are important for kinetic treatment. Monte Carlo simulation method is applied for characterizing the telomerization such as validity of kinetic constants depending on the size of chain length and chain length distribution according to the ratio of chain transfer agent to monomer. The effect of various chain transfer agents to the chain length distribution is evaluated. The effect of differentiation of chain transfer constant as a function of chain length is studied by comparing the average chain length and broadness of chain length distributions of resulting telomers which C-infinity is used as chain transfer constant.