Abstract: Systematic K-Ar Dating has been yieldedfor Pliocene-Recent volcanic eruptions in the Tengchong volcano area, mainly for latesteruptions of Heikongshan, Dayingshan and Maanshan craters. After distignishingplagioclase-phenocryst and olivine-phenocryst with excess argon from samples, a series ageof the matrix of volcanic rocks has been obtained. From time-space exchanges anddistribution, the activities of the Tengchong volcano could be divided into three stages.The first stage developed in the late Pliocene, when the volcanic eruptions occurred insoutheastern and northwestern ends of the Tengchong volcano area. The second stageexperienced in the early Pleistocene suggests that the volcanic activities were migratedand transferred to central areas of the basin. At this stage, volcanic scale anddistribution were largest compared with that in other stages. The third stage occurredduring the early Pleistocene-Holocene. During the late of Early Pleistocene-MiddlePleistocene, volcanic scales were decreased, and mainly distributed on a NS-trending beltin the center of the Tengchong basin. Since late Pleistocene, the volcanic activities havebeen focused on Heikongshan, Dayingshan, and Maanshan areas. There was volcanic activityin Maanshan area in the Holocene. The third volcanic stage is characterized as fromcentral-northern to southern parts, it qets younger and younger. This means that thevolcanic activities are transferred from north to south.