Through a proposed multiple-event analysis of teleseismic P-waves, this study investigated the radiated seismic energy and rupture process of the 2010 JiaSian earthquake. Results showed that the earthquake comprised at least two sub-events. The first sub-event was followed by the second sub-event, ~1.7 s later. The entire source duration was 5.4 s. Let the two sub-events occur on the same fault plane with a strike of 304° and a dip of 28°; the first sub-event had a relatively smaller seismic moment (M₀) and larger radiated seismic energy (E_S) than the second sub-event, and this leads to the E_S/M₀ of the first sub-event larger than that of the second sub-event thus. This feature implies that the first sub-event probably had a higher static stress drop during faulting. The total M₀ was estimated to be 2.17 × 10¹⁸ Nm, corresponding to M_W = 6.15, and the total E_S was ~2.91 × 10¹³ Nm, larger than that estimated only from a single source. Subsequently, the E_S/M₀ was approximately 1.3 × 10^-5, lower than ordinary earthquakes. The low static stress drop was probably responsible for the low E_S/M₀. Overall, the 2010 JiaSian earthquake was characterized by a relatively low E_S/M₀ and low static stress drop, and then the partial stress drop model would be relatively appropriate to interpret its rupture process.