The purpose of this report is to propose a diagnosis and treatment scenario by assistance of bystander and echography robot for trauma patient. Quick treatment is important for patients who have shock by internal bleeding. Therefore, focused assessment with sonography for trauma (FAST), which is a simple and quick diagnostic method, was developed as a first lifesaving step in a hospital. However, a shock patient has little time, and transportation to a hospital may take too long. Therefore, we aim at development of a system which enables FAST at injury scene by assistance of bystander. To develop the system, life-saving flow and a FAST device are significant issues. First, we constructed a diagnosis and treatment scenario. Then, we developed a tele-echography robot system which has 4-DOF that a bystander could attach. This robot is attached to each roughly FAST areas of patient body by a bystander and remotely fine-tuned position by a doctor in a hospital. In this way, a bystander may not do an exact positioning. In addition, the robot has a mechanism to generate contact force between echo probe and patient body surface by two springs. This mechanism not only fit in patient body motion but also reducing the number of controlled axis. To confirm the medical applications of the scenario and the robot, we performed experiments with some examinees and doctors. We confirmed effectiveness of the mechanism and that a bystander could attach the robot to each roughly FAST areas of patient body. We also confirmed that a doctor could do FAST with the robot by remote-controlled on the roughly FAST areas in approximately three minutes. These results show that the robot would enable FAST by assistance of bystander, and the scenario would make FAST faster than the time required transporting the patient to the hospital.