Vital signs monitoring technology is an important part of modern healthcare. With the continuous advancement of medical technology, the existing vital signs monitoring technology can no longer meet people’s needs. Through the analysis of different application scenarios, it can be seen that the new vital signs monitoring technology presents a trend of non-sensory monitoring, long-term monitoring, bed monitoring, and early diagnosis. Remote vital signs monitoring using millimeter wave radar has the advantages of non-contact, continuous and high degree of freedom, and can be used to monitor the vital signs of special patients. However, the signal received by mm-wave radar are very sensitive to random body movements, which reduces the accuracy of heart rate and respiratory rate. To overcome this challenge, we propose a method based on chest mechanical motion modeling to remove random body movements.