A section of “technical detection” was added to “detection” chapter in new Criminal Proceedings Code to legalize “technical detection” measures which have been in obscure state, embodying the balance between human rights protection and crime control, however, there are problems in the Code such as excessive abstraction, excessive summarization and legal omission. In order to make the legislations carried out, legal explanation plays an irreplaceable role, however, the analysis from practical level reveals that there are many problems in the legal explanation of “technical detection”, such as the explanation copying the legal provisions on the problems in applicable range of the judicial cases, ratifying conditions and procedures, criminal types and so on or going out of the legislation to selfcreate institutions. Through the legal explanation and critical analysis of the legal provisions on “technical detection measures”, the reflection on the existed problems in the whole Criminal Proceedings Code from point to overall legislation is revealed and reflected.