The alkali-feldspar phenocrysts in the two contrast Mesozoic granitic rock series, binary mica-adamellite---granite series(S-type)and diorite---porphyritic granodiorite---porphyritic granite series (I-type), of the area are very similar in many aspects. The phenocrysts are of large size, euhedral shape, and carlsbad twin. The plagioclase and biotite inclusions in phenocrysts aligne paralleled with growth face of phenocrysts. Generally, the cores of phenocrysts are rich in plagi- oclase inclusions, but .the quartz inclusions only occurred in tlae rim.The Ab, An, Ba contents in phenocrysts are higher than in groudmass alkalifeldspars. The forming temperature of the phenocrysts calculated from two一feldspar geothermo- meter of Whithey and Stormer (1977) are round 7000C; the X-rays reflections show that most phenocrysts are intermediate orthoclase, the other a few are orthoclase and microcline. All the features above convince that the phenocrysts are crystalized from magma.. Based on experimental data, the work also discu- ssed the crystalizinU processes of the phenocrysts and it is considered that cry- stalized alkali-feldspar phenocrysts represent high vyater content of granitic magma.