1. Breeding process of Streptopelia orientalis was observed in the campus of College of Education, Shinshu University, Nagano city, in 1967.
2. Nest building lasts 2-4 days, the material are small dead twigs snapped from branches or picked up from the ground. The male gathers the material and the female constructs the nest.
3. Clutch-size was two in four nests, and one in one nest. Incubation began immediately after the first egg is laid. The female took her share average for 17 hours, evening to the next morning, the male for 7 hours during the daytime. The incubution period was 15-16 days.
4. Both parents feed the squabs by pumping their crop milk into the latter's mouth inserted into their bill. The same parents' time share of incubation was maintained untill early and middle brooding periods but later parents visited the nest only for feeding. They fed the squabs while brooding and therefore more frequently, 14-19 times a day, during the early and middle periods than 3-4 times a day in later period, The nestling period was 15-17 days.
5. Different nest in the same territory was used for the second brood in which the male fed the first brood squabs when the second was in the incubation period.
6. The territory was determined as B type of MAYR'S (1935) classification.
7. The female engaged about 70% of incubation and brooding. The male worked 60% of feeding and 90% of territory defense.