In order to measure large-scale steel plates accurately,this paper p resents a 3D measurement method which combines laser and computer vision technique,and performs detail researches of key tec hniques,such as extracting laser markers, constructing error field and error correcting.In this paper,we measure steel p lates by using optical scanner and laser total station. The concrete steps of the proposed method are as follows.Firstly,an optic al scanner is used to obtain dense 3D data of a steel plate,and a laser total station is used to measure some laser markers which are adopted to c orrect the result;Secondly,we measure the laser markers by using the optical scanner;Thirdly,we construct an error field using the difference between the markers′ coordinates measured by scanner and laser,respectively;Finally,the constructed error fiel d is used to correct the result measured by the scanner to acquire accurate and dense 3D data.The experimental results show that the ac curacy increases by about 100% by using the combined method compared with the result measured only by a scanner,and the mea surement speed of the combined method is nearly the same as that of computer vision methods,which can satisfy the need of large -scale measurement in industry.