维护当事人的合法权益是律师的主要义务,真实义务是次要义务。律师的真实义务具有片面性、消极性、权利的属性,追求法律真实性四个等特点。辩护律师真实义务的履行表现在如何对待有罪的被告人、如何对待虚假证据和如何对待职业秘密三个方面。 Maintaining the legitimate rights and interests of the parties is the lawyer’s main obligation, the real obligation is a secondary obligation. The true obligation of lawyers has one-sidedness, negativity, the attributes of rights and the pursuit of the authenticity of law. The performance of defense counsel’s true obligations is manifested in how to treat the guilty defendant, how to treat false evidence and how to treat professional secrets.