Specification core: first, evaluation indicator, from 5 dimensions and 22 indicators: qualification skill, standard operation, service quality, safety record, honest performance, implementing 100-point system score management; second, credit classification, divided into five levels: AAA (excellent), AA (good), A (qualified), B (warning), C (dishonesty), A level and above priority dispatch, 10%-20% fee increase, B level rectification within time limit, C level prohibit employment, national publicity; third, score rule, standard maintenance +2 points/time, false maintenance -10 points/time, causing accident -20 points, directly downgrade to C, training assessment +3 points, commendation and reward +5 points; fourth, dishonesty punishment, C level personnel revoke operation certificate, 3-year ban, included in special equipment dishonesty blacklist, not employed by national maintenance enterprises; fifth, platform application, credit data connected to national elevator smart supervision platform, maintenance contract must mark personnel credit level, owners scan code query supervision. After implementation, maintenance violation rate decreased by 65%, service quality satisfaction increased by 40%.