Inclusion Criteria:  6 weeks<After delivery<3 mo postpartum Clinically diagnosed stress or mixed urinary incontinence as the primary problem Women aged 18 years or older  Exclusion Criteria:  Urgency urinary incontinence alone A prolapse greater than stage II on examination (>1cm below the hymen on straining) Third and fourth degree perineal tear; Suffering diastasis recti abdominis and chronic pelvic pain as the primary problem need treatment A history of stress urinary incontinence (SUI) before pregnancy Had previous pelvic surgery Malignant pelvic cancer Genurological infection Had received formal instruction on PFMT in the past 5 years Unsuitable to participate because of significant diseases Others: were unable to contract pelvic floor muscles on digital examination when requested; Inability to use the device in vagina