When considering the indicators safe interval should note: not all monotonous warning indicators are risk-based, that is, the existence of some indicators are non-monotonic. Such as capital adequacy ratio for commercial banks, financial risks undoubtedly has a monotonically decreasing risk characteristics, such as exchange rates and other indicators but the shape is not the case - rate greater than 12 and less than 6 have increasing risk characteristics, this is equivalent to the interval exist within a particular peak is the best, so when security zones in the division to be fully considered.