Abstract: A large microwave Type Ⅳ radio burst associated with CMEwas observed withPhoenix I Corona Radio Spectrometer of Yunnan Observatory on December 16,1988 as an accompanying event. atom 0826 to 0941 UT, a long period oscillation of 12.1 minutes occurred among five main peaks on three wave bands. Ashort periodoscillation of 1.2 minutes appeared among six subpeaks on first main peak. Onthe basis of Beijing Huairou magnetogram, the concerned physical parameters ofburst source region are calculated, e.g. brightness temperature, electron power-lawdistribution, etc. The short period oscillation calculated with the slow wave modelconforms to the observational period. This large Type IV_μ burst, CME and otheraccompanying phenomena are all interpreted preliminarily.