Abstract: Objective  To compare predictive accuracy of S.T.O.N.E.,Guy’s stone score(GSS) and CROES Nephrolithometry Nomogram(CNN) for stone free rate after Percutaneous Nephrolithotomy(PCNL). 
Methods  Our study retrospectively collected clinical data of 133 patients with nephrolithiasis who suffered PCNL,respectively analyzed and compared predictive accuracy of the S.T.O.N.E., GSS and CNN to determine which is the most predictive scoring system and the relation with clinical data ,including operating duration, postoperative length of stay,estimated blood loss,etc.
Result   There are 53 cases (39.85%) in the residual stone group of 133 patients after PCNL. With the increase scores of S.T.O.N.E.and GSS,the stone clearance rate decreased gradually,contrary to the CNN.The predictive stone free accuracy of the CNN is more precise than the S.T.O.N.E.and GSS. 
Conclusion   The predictive stone free accuracy of the CNN is more precise than the S.T.O.N.E.and GSS.

Key words: renal stone, percutaneous nephrolithotomy, S.T.O.N.E.nephrolithometry, Guy stone score, CROES nephrolithometry nomogram