This series of windows with a lifting-sliding hardware system allows the sliding sashes to stop at any position, thus achieving free ventilation of a large or small air volume. Its handle features a child safety lock to protect children from potential dangers caused by opening or closing the window. It adopts ultra-narrow frames to enclose all the sashes, combined with the glass guardrail, offering a wide field of view while ensuring users’ safety. It also applies a bridge-cut structure, insulating glass, and an externally reinforced middle mullion to enable outstanding sealing performance.