[Objective] The soil water dissipation features between purple soil and yellow soil at different temperatures were compared

in order to provide a basis for field management of soil water in the purple soil area.[Methods] The topsoil on purple soil and yellow soil farmland were collected to observe the process of water dissipation at three different temperatures (20

30 and 40℃) conditions

and the evaporation amount and evaporation rate

average evaporation rate and cumulative evaporation amount were then calculated.[Results] ① The evaporation amount

the evaporation rate

the average evaporation rate and the cumulative evaporation amount of purple soil and yellow soil were ranked as 40℃ > 30℃ > 20℃

however

the significant difference only occurred in the incremental stage of soil water evaporation(p<0.05). ② Under the three different temperature conditions

the evaporation amount

the evaporation rate and the average evaporation rate of purple soil and yellow soil increased first and then decreased

and finally tended to be stable. In contrast

the cumulative evaporation amount of purple soil was less than that of yellow soil

and the difference increased with time. ③ The cumulative evaporation amount of soil water changed rapidly at first and then slowly.[Conclusion] The dissipation processes of purple soil and yellow soil are greatly affected by the drying temperature

and the differences occur at the same temperature

especially at the stage of high water content.