Microassembly is critical method to construct complex microsystems with various materials. In this paper，the control tactics and the relevant software architecture which are indispensable in microassembly are developed. The requirement

the main process and human-robot interaction in microassembly are analyzed in detail. The microassembly workstation based on the machine vision is constructed and the look-then-move control pattern for micromanipulation is proposed too. The three-layered control architecture is built up and realized

in which includes task layer

strategy layer and behavior layer. In order to improve reusability

the core classes and association between them are analyzed in software architecture. The classes in task layer

strategy layer are mainly constructed with aggregation mode. At last

the software for microassembly control is finished. The assembly experiments of microsystem composed with six microparts without special surface marker are done with the microassembly workstation. Several critical technical indexes of the assembled microsystems are measured and analyzed with tool microscope. The average values of coaxiality error with automatic microassembly are close to the results with full manual microassembly

but the average values of symmetry error are lower than the result with full manual microassembly and the uncertainty with automatic assembly is better evidently. The efficiency

repeatability

reliability and reusability of microassembly are improved evidently with the control tactics based on the machine vision and software based on three-layered control architecture in this paper.