Picosecond laser-driven high-energy X-ray sources with excellent characteristics of micro-focus，highbrightness and high resolution，have become one of the popular diagnostic methods for studying micro-crack and micro-jetting phenomena of metal materials． Tin has become the preferred material for ejection research on the melting effectbecause of its low melting point，and aluminum is relatively high due to its relatively high melting point，which is noteasy to impact or unload melting to form droplet injection，so the results of aluminum micro-jetting experimental research are relatively few． Based on the nanosecond loading source and picosecond beam diagnostic source of the XGIIIlaser device，the influence of surface geometric defect configuration on the metal micro-injection process was studied，and high-resolution physical images of two typical metal micro-injection processes were obtained through delay control，and important information such as morphological distribution，average velocity and areal density distribution of theejected substances was obtained． The SPH method was used to simulate the experimental results，and the formationmechanism of the ejecta in the experiment and the source of the high-speed ejected material were revealed．