1. Without access to the substantial evidence of the case, the lawyer can't determine whether it is an innocent defense or a light crime defense, or a sentencing defense, and it is impossible to make a judgment prediction-a good case result is made, not predicted out of thin air. Sentencing steps: determine the starting point of sentencing according to the basic crime constitution facts proved by evidence, then determine the benchmark punishment according to the other crime constitution facts proved by evidence, and finally determine sentencing consultation according to the sentencing circumstances proved by evidence, which can't solve the problem of the case itself, because you can learn from many personal cases that it is impossible to solve practical problems without the rights of lawyers and the knowledge, skills and practical experience accumulated by lawyers. Moreover, lawyers gradually carry out specific criminal defense work around the evidence of the whole case, which is a complex and concrete process-thousands of cases become thousands of ways of playing, and you can't fully understand it. 3. Entrusted a criminal defense lawyer specializing in criminal defense business for the first time. Criminal defense is a process, a step-by-step process of specific work with the examination, judgment and application of criminal evidence as the core.