【英文摘要】An avalanche drift detector with photon counting capability is proposed and demonstrated in this project. It combines a depleted drift region between two buried junctions with a ''point-like'' avalanche diode （APD）as the collecting electrode placed on the center at the same side of the entrance window. It is easy to fabricate and has potential advantages to be operated as either in linear mode or in Geiger mode. It can be a single photon detector with high gain, low dark rate, low output capacitance, and large receive area.