With the advent of SAR imaging technology, application of SAR image navigation is rapidly developed in civil life or defense fields. As target recognition plays a big role in SAR image navigation, how to detect those geography ground objects such as river, road and airport automatically and quickly is more and more important. In the last few years, much research has focused on the detection of river, road and airport from SAR images. However, those objects are commonly detected by individual. This paper presents a method capable of detecting linear object ROI such as river, road and airport. All the linear objects ROI in the scene could be extracted quickly at the same time.