Can lawyers intervene during the investigation phase? The answer is yes, as long as the criminal suspect or his close relatives entrust it. Defense lawyers can provide the following assistance to criminal suspects during the investigation: 1. Provide legal advice to criminal suspects to help them understand relevant legal provisions and explain relevant legal issues. The provision of legal advice by lawyers cannot be understood as merely reading out legal provisions or explaining the legal provisions themselves, nor can it be understood as merely answering legal questions raised by criminal suspects. Lawyers have the responsibility to provide help with legal issues related to criminal suspects, whether or not they are raised with the lawyer, such as informing them of their litigation rights and related legal responsibilities. 2. Act as an agent for appeals and accusations, represent criminal suspects in telling their grievances to relevant departments, defend themselves, and accuse investigators and other relevant personnel of infringing on the legitimate rights of criminal suspects. A lawyer's representation in accusations and reports requires the consent of the criminal suspect. However, if the criminal suspect is unable to complain or accuse due to serious illness, or is afraid to complain or accuse because of threats, lawyers can also take the initiative to appeal or accuse to safeguard the legitimate rights and interests of the criminal suspect. 3. If the criminal suspect is arrested, the lawyer can apply for release on bail pending trial.