Focused on the flaws of current deflection test methods of old cement concrete pavement, improvements for deflection test of old cement concrete pavement were proposed. Reasonable temperature of deflection test was studied. The entity engineering deflection of the corner and middle of concrete slab, and the edge of joint were tested. The results show that, in order to reduce the effect of temperature gradient on the deflection test, deflection test needs to be carried out in winter, the test of joint load transfer efficiency needs to be avoided at noon, and the deflection test on the middle of...