In view of the problem of recognition for the value of LCD meter under the industrial field with complex background, an algorithm based on ACSS corner localization is proposed. Firstly, according to the principle of ACSS corner detection, a method which can be suitable to detect vertices of the value area is designed to locate the area. Secondly, the gradation characteristics of the display value is used to determine the area of the string, the local threshold is used to binary the string and then split the string. Finally, three-line scanning method is used to identify the character. Experimental results for heat meter prove the robustness and adaptability of the proposed algorithm.