Investigation and evidence collection right is an important litigation rights to the defense lawyer given by the criminal law and the lawyers' law, whihc is also an important way for a defense lawyer to safeguard the lawful rights and interests of the criminal suspects. However, China's current "criminal procedural law" and "the lawyers law" which related to the defense lawyer investigation and evidence collection right are not perfect, which makes the role of criminal defense of the provisions of the lead to China's defense lawyer can't get fully embody. This article in view of China's defense lawyer investigation and evidence collection, discusses the present situation of the right to defence lawyers and protection investigation of evidence of the significance of the right, analysis of our defense lawyer investigation and evidence collection right can't fully exercise the reasons, and proposed in this foundation the perfect and perfect our country defense lawyer investigation and evidence collection right measures and Suggestions are proposed. This text is divided into five parts. The first part of the defense lawyer investigation of evidence for the outline; The second part of China's defense lawyer investigation and evidence collection of right analysis of the current situation; The third part introduces security defense lawyer investigation and evidence collection of the significance of the right; The fourth part analysis of our defense lawyer investigation of evidence difficult reason; The fifth part to defense lawyer investigation and evidence collection to the improvement of the right to put forward some Suggestions.