The performance of ASN as a public servant, especially in the field of laboratory test services, have many weaknesses. In the era of the industrial revolution 4.0, ASN is required to be able to work professionally, quickly, and precisely in providing excellent service to the public. This study aims to determine the performance improvement, and the ability of ASN in the era of the industrial revolution 4.0 in supporting the realization of excellent laboratory testing services at The Tunnel and Structure Geotechnical Station, Directorate General of Highways, Ministry of Public Works and Housing. This study uses quantitative methods by conducting institutional surveys and qualitative methods by conducting customer satisfaction surveys. Based on the results of the analysis and discussion, it was found that the public service for laboratory testing within The Tunnel and Structure Geotechnical Station, Directorate General of Highways, Ministry of Public Works and Housing has implemented a laboratory quality system thar refers to SNI/ISO 17025:2017. The service performance has been very good with a Public Satisfaction Index value of 81.86. The public service for laboratory testing at The Tunnel and Structure Geotechnical Station has also implemented a Corruption Free Zone and a Clean and Serving Bureaucratic Area.