First of all, the title evaluation only involves your substitute for two years. If the length of service is continuous (that is, the time you change jobs is continuous, and the time you don't work in the middle is no more than one month), you can choose the length of service. You can go to the company where you resigned and issue a certificate to prove when you worked in the company, what is the name and number of the social security account; Then go to the substitute school and issue a certificate to prove when you worked as a substitute teacher in that school. Then you can extend your social security and length of service after paying back the unpaid social security fund for three years (please consult the personnel department of the municipal or district education bureau for details). As for the evaluation of professional titles, it depends on the specific situation, which is hard to say because it varies from place to place. Thank you for accepting a satisfactory answer.