The stack - casting was used for casting the Banliang coins of the early Western Han Dynasty (206B.C.-A.D. 8) and the bronze coins of the Xin Empire (A.D. 9-23 ) and the Eastern Han Dynasty (A.D. 23-220) . It was a main technique for casting bronze coins from the Eastern Han to the time that the sand-mold casting was used. Some Banliang coins of the early Western Han Dynasty and Sizhubanliang coins of the middle Western Han Dynasty were also cast by the stack-casting. But Wuzhu coins were not found to be cast by the stack - casting technique from the middle to late Western Han. The stack-casting were re-used in the early Xin Empire, the metal mold casting was still used in the mints at the same time. It became a main technique in the mints from the late Xin Empire to the Eastern Han Dynasty. The excavations related to the stack-casting for coins could be separated into four groups according to the casting process. There were the clay molds for metal models, the metal models for clay molds, the clay molds for bronze coins and the metal remain of pouring system. Most of them are the metal models and stack-casting clay molds. The stack-casting steps in Han Dynasty were as follows. First, a two-part clay mold was made in order to cast a metal model. Second, a metal model was cast. Third, lots of pieces clay molds were made from the metal model. Each two-part clay mold was a set and about twenties sets were a unit with one pour. After the molds were baked, the molten bronze was poured into the mold's cavity to form bronze coins. Nine metal models of the Xin Empire were analyzed by the X-ray fluorescence instrument. The results show that copper, tin and lead are the main elements. The tin contents concentrate between 4% -6%. It indicated that the central government controlled the metal model casting. The lead contents change from 6% to 12%. It could insure clear inscriptions and outline of a bronze model. This kind of alloy composition could keep a model with a certain strength, hardness, and wear resistance. After some simulated experiment, the production efficiency of stack - casting was much lower than the metal-mold casting was found. This was why the stack-casting was used in the early Western Han Dynasty by the central government and states, but not in the middle and late Western Han Dynasty. In the middle and late Western Han Dynasty, only the central government could cast coins, the whole country need large quantities of numbers of coins. The metal-mold casting could meet the requirement of rapidness and lower cost. Until to Xin Empire, the high quality of coin became the most important, the stack - casting was reused.