In this paper，a low density polyvinyl chloride sealant for robot was prepared， and the effects of glass beads，content and production process on sample density，flowability， viscosity，compressive properties were studied. The results showed that the sample density were related to the properties of glass beads，and the compression resistance of glass beads would affect the final density of the sprayed sample. The sample stability increased and the density decreased with the increase of glass beads content. However，the tensile strength，bending resistance and flowability would also be affected. In mass production，high-speed dispersion and grinding would affect the density reducing effect of glass beads，and the glass beads and materials could be evenly dispersed by pre-mixing and low-speed circulation stirring.