Growth processes of gold particles prepared with the aid of microemulsions are studied focussing on the relationship between the produced particles and the structure of the microemulsion, The microemulsion was composed of sodium dioleylphosphate (SDOLP) or pentaethylene-glycol dodecylether (C12E5), It is found from the size and distribution of the produced particles that there are several retardation processes for Au-particle growth in the SDOLP system, The first retardation appears near the diameter d(m) of the original microemulsion droplets, followed bg successive retardation in lower ranges of water-to-surfactant ratio W-0, The second retardation occurs around the diameter d(nc) of the natural curvature of the microemulsion droplets, Whereas, for larger W-0-values, the first and the second retardations occur around d(nc) and a diameter d(ms) much larger than d(nc). The size distribution of the produced particles is rather broad due to the wide gaps between d(m), d(nc) and d(s.)(m) In the C12E5-system, the size distribution was much broader than that in the SDOLP-system. This arises from the absence of the second retardation which restrains the particle growth of the maximum size, SDOLP can work as a stabilizer of the produced particles. This is caused by the peculiar nature of the microemulsion composed of SDOLP, Taking into account the above retardation mechanism, the size-distribution of Au-particles can be controlled, and Au-particles with sharper size-distribution can be prepared.