In this paper，in view of the problems that radar cannot clearly identify targets in the current coastal defense field，andtheoptoelectronicequipmentisgreatlyaffectedbyclimaticconditions，andtheabilitytodetecttargetsisweak，it is proposed to useradarand optoelectronic equipment inthe field of coastaldefense monitoring，andto coordinatethekey technologiessuchasthedetectionworkflow，adaptivesearchtargetsafterphotoelectricguidanceandaccuratecalibrationof target positions are studied in depth，and the respective technicaladvantages ofradar andoptoelectronics are used to make up for the mutual application defects. The radar and optoelectronics in the field of coastal defense monitoring are realized. With functions such as collaborative detection，the technology overall increases the detection probability of radar or photoelectric single-typeequipmentby anaverageof1.2times，andthepositioningaccuracyislessthan40 meters，which greatlyenhancesChina'sabilitytocontrolandmonitortheoffshoreconditionsandsuspiciousvessels.