The use of acrylonitrile butadiene styrene as shell material for microencapsulation was economical. The coacervation of acrylonitrile butadiene styrene was firstly induced by polydimethylsiloxane for microencapsulation. The OA/ABS microcapsules could maintain the apparent viscosity of in-situ heat system above 100 mP ∙ s for 90 min. Combination of X-ray diffraction analysis and polarizing microscope was firstly used to verify the core-shell structure.