This study explores the influence mechanism of literacy strategy use and independent language skills (e.g., reading and writing) on integrated writing (IW) performance. 322 Secondary Four students from four schools in Hong Kong completed single-text reading, multiple-text reading, independent writing, and IW tasks, along with questionnaires investigating their reading strategy use and IW strategy use. Path analyses revealed that multiple-text reading and independent writing had comparable significant impacts on IW, mediating the influence of single-text comprehension. In addition, reading strategy use impacted IW indirectly through independent literacy skills and IW strategy use, while IW strategies exerted a direct influence on IW. Our findings underscore the critical role of language skills in mediating the influence of reading strategies on IW performance among young first language (L1) learners. The implications for research and practice, are discussed, emphasizing the complexity of the IW construct and the need for balanced language skills and strategy instruction to enhance IW task performance. • A noble exploration of concurrent effects of strategies and independent skills on IW. • Multiple-text reading and independent writing directly influence IW performance. • Independent skills mediate the impact of reading strategies on IW performance. • Reading strategy indirectly affect IW through independent skills and IW strategy. • Balanced language skills and strategy instruction are crucial for IW performance.