关键词: 气泡, 近恒速, 加速段

Abstract: Through the analysis of the air bubble stress under water，the differential equation of air bubble movement in water was established．The simplification was carried out through the value method，and the analytic equation of (h)，with water depth experssing speed，was put forward to describe the whole process of air babble movement including the acceleration phase．The severe acceleration phase is short which is conneted with diameter．and the final uplifted speed is also connected with dia，but has nothing to do with water depth which is contrary to the start speed of approximate constant phase．

Key words: air bubble, near constant speed , accelerates