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In practice, the temperature in the weaned pig house needs to be kept at 26.6`18.3R in winter. In order to decrease energy consumption, a new type of local heating equipment--the warm-bed was applied in the weaned pig house. In this study, the relationship in the number of the weaned pigs lying in the warm-bed, the pigsf age and the indoor aerial temperature was evaluated. The lying behaviour of the weaned piglets was observed and recorded at 08:00 14:00 20:00 and 24:00 everyday during the experiment. The indoor air temperature was measured every 5min. On the basis of the results from the test, the following conclusions may be drawn:

1. When the average indoor temperature was 13.0R, the average air temperature inside the warm-bed with a curtain and without a curtain was 28.6R and 17.9R respectively.
2. When the indoor aerial temperature was lower than 9.9R and the weaned pigs were less than 48-days-old, more than 98.9% of the pigs chose the warm-bed with a curtain to lie.
3. With the growth of pigs, the proportion of the weaned pigs lying in the warm-bed with a curtain decreased from 98.9% to 35.6%.
4. Using the warm-bed, the lower indoor aerial temperature, such as 13.0R, did not affect the performance of the weaned pigs.