Skid resistance of airport runways is an important factor to assure the safety aircraft operations, especially when the runway surface is wet. The grooving installed to shorten the drainage time will lose its effect if the aircraft tire rubber adheres to the pavement surface. ICAO recommends the international criteria as the surface friction coefficients measured by vehicle-type equipment. These values are, however, variable depending on the equipment type and the condition at the measurement. 　This study examines the actural airport runways and deals with these factors influencing the measurement. Furthermore, it investigates the applicability of handy type equipment. The following conclusions are obtained. (1)In the touch-down area where most aircraft lands, the friction coefficient decreases by 0.2 due to aircraft tire rubber adhesion even several months after removing it. (2)The friction coefficient obtained by SFT at this area is smaller by 0.2 - 0.4 than that at the area without rubber adhesion. (3)The friction coefficient varies with the pavement surface temperature; the coefficient measured by SFT in summer is smaller by 0.1 than that in winter. In case of rubber adhered surface, the skid resistance drops to a very low level in relatively low temperature range. (4)The efficiency of drainage of the grooving decreases with the tire rubber adhesion. It leads to an increase of water film thickness at rain fall. (5)As a remedy for obtaining the sufficient skid resistance, the removal of the tire rubber is effective. It brings an increase of the coefficient by 0.1. (6)Of handy type equipment, DF Tester shows the friction coefficient related well with that by SFT.