Abstract: The new Criminal Procedure Law provides that, appraiser opinions must be subject to cross-examination before being used as evidence to decide a case. This provision urges the appraiser to fulfill the obligation to testify in court, and thus enhances the dependence of the effectiveness of expert opinions on cross-examination procedures. Therefore, improving the appraiser testimony system is very important. Discussing on the anonymous appraiser system provides a micro perspective for this issue. China has judicial practice on anonymous witness, but the legitimacy of the anonymous appraiser testimony is still controversial. In essence, these controversies lie in the conflict between the anonymous appraiser and the traditional procedural law principles. The solutions of the conflict are reflected in the principle of the anonymous appraiser, procedure design, and supporting measures.