Using the line array Doppler pins system(DPS) test technique, the velocity history of the collision region of a tungsten alloy plate was measured, and 16 test points were arranged within the 4-mm-long range in the collision region. The velocity curves were processed to obtain the experimental information such as velocity change, pressure distribution, bulge evolution and plate surface damage. Experimental results show that regular reflection occured after two shock waves colliding, and the pressure of the collision region after colliding was 2.5 times of one before colliding. Meanwhile, the pressure distribution in the collision region after colliding dominated the bulge contour of the collision region. And the collision region of the tungsten alloy flying layer took on a tip-shaped structure.