The 2019 “Environmental Analysis Laboratories Accreditation Service Program” was commenced for the Environment Analysis Laboratory, Environmental Protection Administration, Executive Yuan. The accreditation works of quality system and testing techniques of applied items for both new-setup and in-operation environmental analytical and local motive analytical laboratories, which had been arranged based on the “Management Regulations of Environmental Analysis Organization” and the “Management Regulations of the Motor Vehicle Emissions and Noise testing organizations”. These accrediting works included laboratory quality management system accrediting, testing techniques accrediting (in-lab instrumentation and in-field sampling), and proficiency tests (in-lab and in-field). After these accrediting works had been done, the Technical Assessment Committee evaluated the records of these auditing works and made the final decision of approval of the application of new-setup or/and in-operation laboratories. One auditing methodology conference for the auditing specialist and the members of Technical Assessment Committee and a conference for the authorized environmental analysis organizations were held in this year. There were 166 cases of documentation evaluation, 42 cases of quality system auditing, 85 cases of proficiency testing (in-lab and in-field), 200 cases of testing techniques accrediting (in-lab instrumentation and in-field sampling) and 157 cases of report signatory qualification had been evaluated within 8 Technical Assessment Committee meetings. There were 4791 performance test samples sent to 98 laboratories this year, the satisfactory rate of performance test was 98.2%. There were no significant differences in auditing reports and performance test by statistics as compared with previous year, which indicates the sustainable performance of these authorized environmental analysis organizations.