Technical investigation is playing a more and more important role, in the criminal investigation. The new law of criminal procedure stipulates that the procuratorial authority has the power to decide whether to adopt technical investigation but no power to execute it. The division of the decision-making power and power of execution violates the principal of the independence of procuratorial power, which definitly decreases the effects of technical investigation and is unfit for investigation of duty crimes. The independence of procuratorial power should be made clear. And giving the power of execution to the procuratorial authority shall not fall into the range of duplicate construction. The theory that the public security organization should supervise the investigation of the procuratorial authority is not supported by juridical logics.