OYO's business started from the investigation of ground structures for public authorities. Now, it has sprung out to four major business domains, namely, Construction, Environment, Disaster Management, and, Future Energy/Natural Resources. OYO has three methods to work on these domains, namely, Engineering, Consultation, and very uniquely, Manufacturing of Measurement Instruments.

	・Geotechnical survey ・Rock mechanics test ・Soil mechanics test ・Borehole logging ・Maintenance of infrastructure facilities	・New buildings and infrastructure projects ・Traffic management ・Tunnel assessment	・Geotechnical testing ・Non-destructive testing
	・Pollution prevention and remediation ・Underground water investigation ・Heavy metal analysis	・Preserving and reviving natural environment ・Pollution recovery planning ・River management ・CCS	Environmental monitoring
	・Damage estimation ・Minimizing damage ・Tsunami simulation ・Rock fall simulation ・Flood simulation	・Natural hazard management ・Business continuity management ・Disaster recovery planning	・Earthquake monitoring ・Landslide monitoring ・UX/IED detection
	・Geophysical exploration ・Laboratory testing	・New energy development ・Site selection & assessment	・Geophysical exploration