The relationship between domain switching and acoustic emission (AE) during poling was investigated using the tetragonal ferroelectric ceramics with composition of (Pb,La)TiO3+0.01MnO2 The amount of AE generation during poling increased with increasing dc electric field and raising temperature. It was confirmed that the change of the amount of AE generation with poling condition resulted from the difference of the amount of 90$^{circ}$ domain switching and total amount of AE generation for 10 minutes was approximately proportional to the amount of 90$^{circ}$domain switching. The A generations of two specimens which have different tetragonality rations(c/s rations) 15 at% and 24at% La-doped were also investigated. The sample with c/a ratio of 1.012 where 90$^{circ}$ domains are dominate had larger amount of AE generation and 90$^{circ}$ domain switching compared with the sample with c/a ratio of 1.004 where 180$^{circ}$ domains are dominant.