A 760 \(\times\) 760 \(\times\) 30 mm\(^3\) plastic scintillation detector viewed by photomultiplier tubes (PMTs) from four corners has been developed, and the detector has been tested with cosmic rays and \(\gamma\) rays. A position-independent effective time T\(_{eff}\) has been found, indicating this detector can be used as a TOF detector. The hit position can also be reconstructed by the time from four corners. A TOF resolution of 236 ps and a position resolution of 48 mm have been achieved, and the detection efficiency has also been investigated.