Abstract: In recent years，the stealth technology is becoming more and more common which promotes the development of the anti-stealth technology and puts forward higher requirements on the performance of radar system.Also，spatial small target detection and planetary defense need high performance of remote sensors.Therefore it has become a hot research topic to improve the remote sensor system and improve the sensor sensitivity by using quantumtechnology with the development of quantum information and quantum computers.In addition，quantum operation technology also helps to design and implement quantum sensor hardware.All above have prompted the birth of quantum radar which can detect，identify and distinguish the RF stealth platforms and weapons systems.Preliminary study results show thatquantum radar depending on a small amount of photons entangled superposition has a quadratic increase of resolution when compared to that without entangled photons.For the same target，quantum radar has farther detection distance than the traditional radar and application of quantum radar cross section side lobe provides a new detection method for RF stealth target.This paper introduces the basic concept and classification of quantum radar，detection mechanism，and analyzes the performance of several different measurement methods based on the perspective of interferometry for interferencequantum radar.Phase estimation error and target distance estimation error points out the quantum limit of measuring methods and system super sensitivity area.