To develop the Scale of Paranoid Personality Organization Type (SPPOT) and test its reliability and validity, the initial scale was developed based on the diagnostic standard in the Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5) of PPD, personality organization theory and the clinical behavior samples. Sample 1 of 683 effective participants filled out SPPOT and Millon Clinical Multiaxial Inventory-III (MCMI-III). Sample 2 of 484 subjects filled out SPPOT and Inventory of Personality Organization (IPO). 60 effective participants were involved in checking of test-retest correlation at 5-week intervals. The final version of SPPOT had 18 items (including 4 lie detection items) and 3 dimensions: Hostile (Ht), Distrust (Dt) and Paranoid Thinking (PT), which cumulatively explained 42.28% variance. The scale had good structural validity (χ²/df=1.1, RMSEA=0.01, GFI=0.98, NFI=0.95, CFI=0.99). Cronbach’s α of SPPOT, Ht, Dt and PT was 0.77, 0.64, 0.35 and 0.64 respectively. The intraclass correlation coefficient (ICC) of Ht, Dt, PT and SPPOT were 0.79, 0.72, 0.63 and 0.75 (P<0.001). The criterion-related validity with MCMI-III and IPO sounded acceptable (r=0.13–0.31, P<0.001). SPPOT generally meets the measurement requirements for paranoid personality types and levels of personality organization.

paranoid personality disorder, personality organization, Cronbach’s alpha coefficient, Scale of Paranoid Personality Organization Type (SPPOT)