The friction magnetic memory test was carried out in the geomagnetic field environment with 40CrMo block specimen and the 316 L pin specimen as a pinonblock friction pairs.The influence of different detection direction and different friction direction on the detection and formation of magnetic memory signals was investigated.The result show that the tangential friction magnetic memory signals can indicate the location and the width of the wear scar accurately.The different detection direction affects the friction magnetic memory signals,and this effect is connected with the geomagnetic field under the different detection direction.The greater the geomagnetic field intensity is,the greater the magnetization on the wear scar becomes,and the greater the difference is between the friction magnetic memory signals and the geomagnetic field intensity.When keeping the detection direction unchanged,the different friction directions have little influence on the formation of friction magnetic memory signals