In this paper, H.245 protocol (control protocol for multimedia communication) is introduced, which is a section of H.324 protocol (terminal for low bitrate multimedia communication). H.245 protocol is realized in Windows 95 situation on PC. The ASN.1 (abstract systax notation one, X.680 protocol) and PER (X.691 protocol) are also used to encode the signals of H.245, which is realized by a compiler and encoder/decoder. The transporting method of signals of H.245 in H.324 system is also introduced. The resour...