As the fundamental law of the country，the Constitution plays a cornerstone role in the legal system of any country，which largely determines the form and development direction of the criminal procedure law as a departmental law. Under the era of contemporary human rights protection consciousness gradually reaching the hearts of the people，the criminal procedure law is often called the “small constitution” because of its prominent role in protecting citizens' rights.The constitution is closely related to the criminal procedure law，it has many intersections in restricting state power and safeguarding civil rights. However，due to differences in their political systems，there are many differences in the relationship between the Constitution and the Criminal Procedure Law. As the first country in the world to formulate a written constitution，the United States has a certain representativeness of its interaction with the Constitution and the Criminal Procedure Law，which can provide us with some reference and reference.