A newly developed Deep Ocean Compact Autonomous Raman Spectrometer(DOCARS) system is introduced and used for in-situ detection of acid radical ions in this paper. To evaluate the feasibility and capability of DOCARS for quantitative analysis of the acid radical ions in the deep ocean,extensive investigations have been carried out both in laboratory and sea trials during the development phase. In the laboratory investigations,Raman spectra of the prepared samples(acid radical ions solutions) were obtained,and analyzed using the method of internal standard normalization in data processing. The Raman signal of acid radical ions was normalized by that of water molecules. The calibration curve showed that the normalized Raman signal intensity of SO24 ˉ,NO ˉ 3,and HCO ˉ 3 increases linearly as the concentration rises with correlation coefficient R 2 of 0.99,0.99,and 0.98 respectively. The linear function obtained from the calibration curve was then used for the analysis of the spectra data acquired in the sea trial under a simulating chemical field in the deep-sea environment. It was found that the detected concentration of NO ˉ 3 according to the linear function can refl ect the concentration changes of NO ˉ 3 after the sample was released,and the detection accuracy of the DOCARS system for SO24 ˉ is 8%. All the results showed that the DOCARS system has great potential in quantitative detection of acid radical ions under the deep-sea environment,while the sensitivity of the DOCARS system is expected to be improved. A newly developed Deep Ocean Compact Autonomous Raman Spectrometer (DOCARS) system is introduced and used for in-situ detection of acid radical ions in this paper. To evaluate the feasibility and capability of DOCARS for quantitative analysis of the acid radical ions in the deep ocean extensive investigations have been carried out both in laboratory and sea trials during the development phase. In the laboratory investigations, Raman spectra of the prepared samples (acid radical ions solutions) were obtained, and analyzed using the method of internal standard normalization in data processing The Raman signal of acid radical ions was normalized by that of water molecules. The calibration curve showed that the normalized Raman signal intensity of SO24-, NO ˉ 3, and HCO ˉ 3 increases linearly as the concentration rises with the correlation coefficient R 2 of 0.99, 0.99, and 0.98 respectively. The linear function obtained from the calibration curve was then used for the analysis of the spectra dat a acquired in the sea trial under a simulating chemical field in the deep-sea environment. It was found that the detected concentration of NO ˉ 3 according to the linear function can refl ect the concentration changes of NO ˉ 3 after the sample was released, and the detection accuracy of the DOCARS system for SO24- is 8%. All the results showed that the DOCARS system has great potential in quantitative detection of acid radical ions under the deep-sea environment, while the sensitivity of the DOCARS system is expected to be improved.