Heterogeneous catalysts mediated reaction system should compensate some of drawbacks observed in previously reported reactions. We have obtained magnetic nanoparticles (MNPs) were using a reduction–precipitation method and characterized for nano particle verification. This method is very easy and extremely efficient for the Knoevenagel reaction. We have use aromatic aldehydes with various active methylene containing compounds. It give Knoevenagel products in good to excellent yields at refluxed temperature and work with elevated temperature condition.