This study investigates the spray characteristics before and after wall impingingment of gasoline spray in suction air flow. For this study, a rectangular model intake port was made of acrylic glass, and suction air was generated by using the forced air blower contrariwise. The injector for this study was a pintle-type port gasoline injector in which an air-assist adaptor is installed to supply assisted air. A PDPA system was employed to simultaneously measure the size and velocity of droplets near the wall. Measured droplets are divided into "pre-impinging droplets" with positive normal velocity and "post-impinging droplets" were negative normal velocity for the suction flow. The velocities, size distributions and Sauter mean diameter (SMD) of pre-and post-impinging droplets for varions injection angles and air-assists are comparatively analyzed.