Value of the Data •The dataset contain rock magnetic parameters of lacustrine sediments from the Heqing basin. The method can be applied to reveal the magnetic mineralogy, their concentration and domain state of materials like rock, sediment and soils, e.g.. •The lacustrine sediments were strong influenced by reductive dissolution of magnetic oxides. In environment magnetism research, the relationship between rock magnetic properties and magnetic mineral dissolution can be mirrored for the paleoenvironmental interpretation of the magnetic properties of lake and marine sediments. •The rock magnetic parameters (χ) revealed the characteristics of Indian Monsoon in SW China during the past 920 ka, and can deepen our understanding about the spatial distribution of characteristics of Indian Monsoon in different times.