Abstract: Specimens from the monotectic systems Zn-Pb,Al-Pb were te-sted by using Chinese recoverable satellite in microgravity.The physical lawsof remelting of the Al-Pb alloy below critical temperature have been resear-ched;the influences of Marangoni convection have been discovered thro-ugh the miscibility gap in microgravity and a homogeneous dispersion sampleof Zn-Pb powder alloy was obtained by using the liquid sintering in micr-ogravity.The researches in microgravity have proved the results as follows:although the microgravity condition can eliminate the macrosegregation andthe natural convection caused by gravity in monotectic alloys,the nongra-vity factors play an important role in the segregation of monotectic alloys.