The invention discloses an intelligent rate method detection data processing method applied to a biochemical analyzer. The method comprises the following steps that accumulative slope mean values from start of reacting to stop of reacting are calculated; whether the analyzer conducts calculation according to a selected detection window and reports a result or conducts diluting for reworking is determined according to the fact that whether the formula (please see the formula in the description) is tenable or not and whether an inflection point is generated or not, wherein the inflection point means that three continuous accumulative slopes and regression coefficients are all decreased, and the subsequent accumulative slopes and regression coefficients are not increased any more. According to the method, low-concentration samples, normal-concentration samples and high-concentration samples can be automatically identified, misjudgment of the analyzer on a detection result is avoided, and the accuracy of the detection result is guaranteed.