Micro-grinding technology is able to achieve high-precision, high-efficiency and low-cost machining of micro-parts on hard and brittle materials. Based on the deeply understanding of micro-grinding mechanism, the cutting models of single abrasive particles including cone, sphere, triangular pyramid and rectangular pyramid were established, which took the radius of edge arc into account. The abrasive particle shape and distribution of the micro-grinding tool with Φ0.5 mm, #600 were observed and counted by ultra depth optical microscope VHX-1000. Then the micro-grinding force models based on single abrasive particle models and comprehensive abrasive particle model were established. The micro-grinding experiment was performed on the ZCuZn38 and the measured micro-grinding force was compared with that obtained from micro-grinding models. The change of micro-grinding force with process parameters was discussed according to the proposed micro-grinding force models. The results show that the micro-grinding force models based on single type of abrasive particles and different types of abrasive particles can predict the micro grinding force under various process parameters. However, the micro-grinding force model based on different types of abrasive particles has minimal error. The normal grinding forces calculated from different single abrasive particle models are close, but the calculated tangential grinding forces are obviously different.