This paper gives the original intention of the standardization design specification of high voltage power network relay protection proposed by State Grid Corporation of China, and analyzes the derived matching function due to standardized design. It introduces the designs of the current widely used matching function scheme based on off-line file management, and puts forward new problems in engineering application and management when these schemes are applied to local protection. This paper presents realization scheme of online customized matching function based on remote setting, and combining the specific design of the device, states in detail the function design of on-line customization system in terms of the customization of man-machine interaction module, protection function module, signal communication module, communication model and value customization module, as well as the handling of special problems in the process of online reconstruction. Finally, compared to the scheme using off-line configuration file, online customization matching system shows its advantages in the test and management, and the specific customization system is given.