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Primary frequency control (PFC) has the ability to meet the fast load variation in a power system. Many researches have been done to improve the PFC ability only taking a whole system as the object, which can not give satisfaction to the security and stability of the multi-area power system as it becomes a developing trend in practice. Therefore, it is practically important to study the PFC ability distribution on power system security and stability in multi-area power system. In this paper, a new concept of PFC ability distribution of multi-area power system is presented. The influences of PFC ability distribution on power system frequency characteristics and tie-line power transmission are analyzed with simulation method. It is concluded that uniform PFC ability distribution is a reasonable form for multi-area power system.