The invention discloses a method for customizing communication protocol which comprises: determining information element IE needed by customized communication protocol and all kinds of attributes of the IE, matching the IE and attribute of IE to two-dimension relation according to level of IE and dependence relation of IE, matching different attributes of same IE to same row of two-dimensional relation, matching same attribute of different IE to same list of two-dimension relation. The communication protocol needed to be customized can be intuitively and regularly represented through IE, IE level, dependence relation of IEs and other attribute of IE because the communication protocol is described by adopting two-dimension relation, further program code aiming at the communication protocolis developed more easily, automation of the communication protocol is easy. The invention also discloses a device for customizing communication protocol, method and device for converting communication protocol description.