本文用費多洛夫法,对深成岩中斜长石的二种巴温諾复杂双晶进行了观察;並試图用三重晶理論进行解釋。其一是以(021)为組合面的巴溫諾右律复杂双晶;另一是依第一結晶軸作四連晶式貫穿的巴溫諾右律复杂双晶。根据这二种双晶的組合方式和生长遺跡,推测上述巴溫諾复杂双晶都是由一个結晶中心发生的,並由此中心再继續生长发育成双晶体。 In this paper, two kinds of Parvignam complex twins of plagioclase in deep plutons were observed by the Ferdinand method, and the triplet theory was taken as an explanation. The first one is the Parvignino-Rho complex dual-crystal with (021) as the combined surface, the other is the tetrapan-net-type right dual-law complex double crystal with the first crystal axis. According to the combination of the two kinds of twins and the growth relics, it is presumed that the above parvignano complex twin occurs from one crystallization center, and then the center grows into double crystals again.