Legal analysis: Yes, if the case cannot be tried without a lawyer as a witness, according to the principle of witness priority, the lawyer must appear in court as a witness.
Legal basis: "Evidence that can be used to prove the facts of the case as stipulated in Article 50 of the National Criminal Procedure Law of the People's Republic of China is evidence.
Evidence includes:
(1) Physical evidence;
(2) Documentary evidence;
(3) Witness testimony;
(4) Victim's statement;
(5) Criminal suspect's and defendant's confession and defense;
(6) Identification conclusion;
(7) Inspection and examination , identification, investigation and experiment records;
(8) Audio-visual materials and electronic data
Evidence must be verified to be true before it can be used as the basis for filing a case.