Firstly, after analyzing the dynamic mechanism of customer retention rate affected by the three most important effects which are the detainment excitation effect, the natural bleeding effect and the wordofmouth effect, the evolution route of customer retention rate in customer detainment cycle is obtained; secondly, three coefficients influencing customer retention rate are proposed, which describe the effects above, including detainment excitation coefficient, natural attenuation quotient and wordofmouth influence coefficient; thirdly, customer detainment cycle model and customer detainment value model are gained based on the evolution route of customer retention rate; finally, two models are established: the customer detainment cost computation model, in which the available range of the detainment cost, the high efficiency range of the detainment and the low efficiency range of the detainment are obtained; the onetoone customer churn detainment model is established based on Detainment Profit Function and Detain Marginal Profit Function defined, and the selection rules of customer detainment order are deduced based on the limitation of detainment budget. The experiments results suggest that the customer churn detainment method put forward in this paper is feasible and very efficient.