BACKGROUND: Urinary incontinence can be divided into stress, urgent and mixed types, they can not be easily distinguished only basing on clinical experience, which often result in misdiagnose or improper treatment OBJECTIVE: To discuss the value of urodynamical inspection, especially stress leak point pressure (SLPP) determination in the diagnose of female stress urinary incontinence.DESIGN: Retrospective paralleled comparison observation.SETTING: Center of General Urology Department, Southern Hospital,Third Military Medical University of Chinese PLA PARTICIPANTS: Totally 120 female patients who received medical treatment in the uropoiesis surgical department of the Southwest hospital due to urinary incontinence between January 1996 and May 2002 were enrolled in this experiment.gle was determined and considered as normal if it was ＜100° and abnormal if ＞ 100°. Urethral tilt angle is judged as normal if ＜ 45° and abnormal if ＞45°; Urethrovesical junction (when static state) was judged as normal if not tion: including fulling urinary bladder pressure measurement, static urethral Cystourethrography classification standard: type Ⅰ refers to posterior urethrovesical angle vanished with urethral tilt angle＜45° and the biggest urethra closure pressure＞20 cmH2O; type Ⅱ: refers to posterior urethrovesical angle vanished with urethral tilt angle＞45° and the biggest urethra closure pressure＜20 cmH2O; type Ⅲ refers to normal posterior urethrovesical angle with urethral tilt angle＜45° and the biggest urethra closure pressure ＞20 cmH2O. SLPP classification standard: typeⅠ: SLPP ＞120 cmH2O; type Ⅱ: SLPP of 90- 120 cmH2O; type Ⅲ: SLPP ＜ 60 cmH2O;type Ⅱ/Ⅲ: SLPP of 60 - 90 cmH2O.compared with that of cystourethrographic classification.RESETS: Totally120 patients all remained in the final result analysis.stress urinary incontinence, 64 cases as symptomatic stress urinary incontinence including 28 cases of unstable bladder and 36 cases of low compliclassification: of the 56 genuine stress urinary incontinence, 20 cases were diagnosed as type Ⅰ; 16 cases as type Ⅱ and 10 cases as type Ⅱ/Ⅲ; 10cases as type Ⅲ. Two classification was proved of 100% consistency in type Ⅰ and Ⅲ, and 94.1% and 90.1% in type Ⅱ and type Ⅱ/Ⅲ respectively, difference was not remarkable (P＞0.05).CONCLUSION: SLPP determination can be used to make accurate classification of female genuine stress urinary incontinence, possessing important instructive significance for the treatment.