Surface acoustic wave (SAW) device can be used for wireless sensing measurement without power supply, so it′s important to master the force condition in the metal slit intuitively by measuring contact stress with SAW device in metal slit. SAW signal transmission in the metal slit has been investigated by using the mcirostrip line as the transmission line in this work.The effect of the metallic slit on the transmission performance of the mcirostrip line has also been analyzed.The signal transmission line and its matching circuit have been designed.The wire bonding wire is adopted to connect the resonator and the microstrip line and tested through experiment.Through research on the problem of signal transmission in metal slit,the feasibility of the stress measurement in extreme environment such as metallic slit has been verified.