SCAIC continued the WS-1 development in the 1990s and introduced the improved WS-1B in the late 1990s. The WS-1B mainly targeted the foreign customers and was actively marketed by Beijing-based China National Precision Machinery Corporation (CPMIEC). Again the weapon system failed to attract any buyer. Compared to the WS-1, the WS-1B features an increased range of 180km.